JPH1068912A - contact lens - Google Patents

Abstract

(57) [Problem] To provide a contact lens capable of clearly separating an image between an image by a near portion and an image by a far portion and obtaining a clear visual acuity. SOLUTION: A lens curve (2) in which a near portion curved surface (N) for seeing near and a far portion curved surface (F) for seeing far away are formed concentrically with respect to the optical axis (10). In the contact lens (1) having an optical axis, a curved surface including one near portion curved surface or one far portion curved surface including the optical axis is defined as a first curved surface (5), and one curved surface outside the first curved surface is adjacent to the first curved surface. A curved surface formed by a distance portion curved surface or one near portion curved surface is defined as a second curved surface (6), and is defined on the lens curve with a predetermined radius as a radius centered on an intersection (O) between the lens curve and the optical axis. A light reducing means (8) for reducing the amount of light transmitted through the central curved surface region is formed in the central curved surface region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact lens having a lens curve in which a near portion curved surface for viewing near and a far portion curved surface for viewing far away are formed concentrically with respect to an optical axis. More particularly, the present invention relates to a contact lens for sharply separating an image by each of a near portion curved surface and a far portion curved surface.

[0002]

2. Description of the Related Art A bifocal contact lens has a concentric near zone at the center of the lens including the optical axis and is surrounded by a concentric annular zone at the periphery. It has been proposed (for example, Japanese Patent Application Laid-Open No. 60-9132).
7).

In FIG. 25, a contact lens 1 is
It has a front curve 2 formed by a near portion curved surface N for viewing near and a far portion curved surface F for viewing far away, and a base curve 3 corresponding to the corneal curved surface of the wearer. In this case, the lens body is fitted to the central part of the corneal surface of the eye, and about 80 feet (about 24.4 m) of a candle (80
Under the light conditions for average reading defined as foot candles, the near zone occupies approximately half of the pupil of the eye.

[0004] A contact lens wearer who satisfies such conditions can select the far or near side of the wearer's own simultaneous viewing based on the wearer's own consciousness. Can be used smoothly without difficulty. However, when a contact lens is actually worn, it is often the case that the optical center of the lens is displaced from the pupil center position, and it is sometimes difficult to use the distance portion and the near portion smoothly and smoothly. Therefore, a multifocal contact lens for eliminating such a problem has been proposed (for example, Japanese Patent Application Laid-Open No. 7-239559).

A contact lens 1 shown in FIG. 26 has a front curve 2 formed by a near portion curved surface N and a far portion curved surface F.
And a base curve 3 corresponding to the curved surface of the cornea of the wearer. This contact lens 1 has a near portion area (diameter: 0.8 mm to 3.5 mm) including an optical axis with respect to a vertical meridian passing through the geometric center of the contact lens in advance.
Is a multifocal contact lens formed at a position shifted from the nose side by 0.2 mm to 2.4 mm. Further, as a rotation preventing means for positioning at the time of wearing, prism ballast processing is performed, and slab-off processing is performed around the lens. According to the contact lens 1 shown in FIG. 26, when the lens is worn, the optical axis at the center of the near portion area of the lens can be made to substantially coincide with the center position of the pupil of the eye.

As a multifocal contact lens for removing spherical aberration, there has been proposed a multifocal contact lens in which a distance portion region and a near portion region are alternately and repeatedly arranged in a concentric band shape (for example, Japanese Patent Application Laid-Open No. H11-157556). JP-A-5-5080
19).

[0007] As one of these lenses, a contact lens 1 shown in FIG. 27 has far-distance curved surfaces F1, F2,... For viewing far away and near-division curved surfaces N1, N2 for looking near.
.. have a front curve formed alternately and repeatedly in a concentric band shape. In this lens, the distance portion curved surface (F
1, F2...) Are arranged such that light rays parallel to the optical axis are imaged at substantially the same point on the optical axis, and are incident on these near-use curved surfaces (N1, N2...). A light beam parallel to the axis is arranged so as to form an image at substantially the same point on the optical axis.

Further, a concentric progressive multifocal contact lens in which the central region including the optical axis of the lens is a distance portion and the addition power is continuously increased from the intermediate portion to the peripheral portion has been proposed. (For example, Hisao Magutani: Presbyopia contact lens. New Ophthalmology 10: 1543-1544,19
95).

A contact lens 1 shown in FIG. 28 has a front curve 2 composed of a single spherical surface and a base curve 3 composed of an inner hyperbolic aspherical surface. In this lens, the central region of the lens of the base curve 3 is formed as a distance portion, and the power of the near portion is continuously increased from the middle portion to the peripheral portion. In the prescription of the lens, the base curve 3 is rapidly flattened from the vertex to the edge, so that the base curve 3 on the inner surface of the vertex is prescribed to be steeper than the corneal curvature radius.

[0010]

In the above-mentioned various conventional contact lenses in which the near portion and the far portion coexist, it is difficult to clearly separate the image by the near portion and the image by the far portion. There was a problem.

The inventor has made the following insights into the cause of this problem, and the present invention is based on the following insights and findings by the inventor.

That is, a light beam emitted from a lens central region including a near portion curved surface or a far portion curved surface including an optical axis is a lens having a far portion curved surface or a quoted portion curved surface outside the lens central region. Light emitted from the peripheral region and contributing to image formation interferes with the image forming surface of the lens peripheral region, and exits from the lens central region to an image formed by the lens peripheral region on the image forming surface of the lens peripheral region. The light beams thus overlapped with each other, and as a result, a clear image due to the peripheral area of the lens cannot be obtained. Note that the term "interference" does not mean so-called interference relating to the phase of a light wave, but means that a light beam contributing to image formation on an image plane is overlapped with another light beam which is a disturbing noise that does not contribute to image formation. Used in a meaning. The same applies to “interference” used hereinafter.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to obtain a clear visual acuity by clearly separating an image between a near portion image and a far portion image. Is to provide a contact lens that can be used.

[0014]

In order to achieve the above object, a contact lens according to the present invention has a near portion curved surface for viewing near and a far portion curved surface for viewing far away with respect to the optical axis. In a contact lens having a lens curve formed concentrically, a curved surface formed of one near portion curved surface or one far portion curved surface including the optical axis is defined as a first curved surface, and is adjacent to the outside of the first curved surface. A curved surface composed of one distance portion curved surface or one near portion curved surface is defined as a second curved surface, and is defined on the lens curve with a predetermined radius as a radius around an intersection of the lens curve and the optical axis. A light reducing means for reducing the amount of light transmitted through the central curved surface area is formed in the central curved surface area.

Further, the first curved surface is a near portion curved surface,
The second curved surface is a distance portion curved surface, and the first imaging surface that is the imaging surface of the first curved surface is more from the lens curve than the second imaging surface that is the imaging surface of the second curved surface. The dimming means is formed in the central curved region so as to be close to the first curved surface so as to reduce the amount of light transmitted through the first curved surface and condensed on the first imaging surface and reaching the second imaging surface. It is characterized by having done.

The first curved surface is a distance portion curved surface,
The second curved surface is a near portion curved surface, and the first image forming surface which is the image forming surface of the first curved surface is more from the lens curve than the second image forming surface which is the image forming surface of the second curved surface. The dimming means is formed in the central curved surface region so as to reduce a light amount of a light beam which is located at a distant position and passes through the first curved surface and reaches the second imaging surface.

Further, the first image plane is a first focal plane which is a focal plane of the first curved surface, and the second image plane is a second focal plane which is a focal plane of the second curved surface. There is a feature. A first focal point, which is a focal point of the first curved surface;
The second focal point, which is the focal point of the second curved surface, is on the optical axis.

Further, the central curved surface area is defined as a range of the first curved surface. Further, the central curved surface region is a part of the first curved surface.
Further, the light reducing means is a shielding means for shielding transmission of light. Further, a near portion curved surface and a far portion curved surface are alternately and repeatedly formed concentrically with respect to the optical axis outside the second curved surface. Further, the central curved surface area is the first curved surface and a range beyond the first curved surface. Further, the light reducing means is formed in a thin film shape on the lens curve.
The size of the predetermined radius is set according to the size of the pupil. Further, the dimming means includes:
It is formed when the contact lens body is polymerized. Further, the dimming means is formed by dyeing after polymerizing the contact lens body. Further, it is characterized in that the dimming means sets a dimming rate according to the staining density. Further, the lens curve is a front curve facing a base curve.

The outline of the present invention will be described below.
In FIG. 29, a contact lens 1 has a base curve 2
The front curve 3 has near portions N and far portions F alternately formed concentrically with respect to the optical axis 10. A curved surface including the optical axis 10 is defined as a first curved surface 5, and a curved surface adjacent to the outside of the first curved surface 5 is defined as a second curved surface 6.
And In the example shown in FIG. 29, the first curved surface is the near portion curved surface N
, And the second curved surface 6 is constituted by a distance portion curved surface F.

The focal plane of the first curved surface 5, that is, the focal plane of the lens portion composed of the first curved surface 5 and the base curve 3 is simply called the focal plane of the first curved surface 5, and this is the first focal plane 11
And The focal plane of the second curved surface 6, that is, the focal plane of the lens portion composed of the second curved surface 6 and the base curve 3 is simply referred to as the focal plane of the second curved surface 6.
3 is assumed.

An image plane on which an object located in front of the front curve 2 is imaged by the lens portion including the first curved surface 5 and the base curve 3 is defined as a first image plane. An image plane on which an object in front of the front curve 2 is formed by a lens portion including the second curved surface 6 and the base curve 3 is defined as a second image forming surface.

In the case of a contact lens, the position of the first image plane is an amount that varies according to the position of the object, but is substantially near the position of the first focal plane 11, and similarly, the position of the second image plane The position of the plane can be considered to be near the position of the second focal plane 13. Therefore, in the following description, description will be made with reference to the first focal plane 5 instead of the first image plane, and will be described with reference to the second focal plane 13 instead of the second image plane.
That is, the object is located at infinity and the front curve 2
Will be described by taking as an example a case where parallel rays are incident and the focal plane becomes an image forming plane. However, this is for convenience of explanation and does not lose the generality of the present invention.

In FIG. 29, it is assumed that an object point J (not shown) is located at an infinite distance of the front curve 2, and an image point K of the object point J by a first curved surface and an image point L by a second curved surface are considered. Light rays 21 and 2 emitted from the first curved surface 5 composed of the near portion curved surface N
2 condenses and forms an image at the first focal point 12 on the first focal plane 11 as an image point K, and thereafter diverges to reach the second focal plane 13. Also, the light beam 2 emitted from the second curved surface 6 composed of the far portion curved surface F
The light beams 3 and 24 are condensed and formed as image points L on the second focal point 14 on the second focal plane 13 as an annular light beam surrounded by the light beams 23 and 24.

Here, as can be seen from FIG.
The image point K by the first curved surface 5 is surrounded on the first focal plane 11 by an annular ring 25 formed by a light beam surrounded by the light beams 23 and 24 emitted from the second curved surface 6. Does not overlap with the annular ring 25. That is, the image point K by the first curved surface 5 is not “interfered” by the light beam emitted from the second curved surface 6 on the first focal plane 11.

On the other hand, the image point L by the second curved surface 6 is
On the second focal plane 13, the light is superimposed on a disk 26 made of a background light formed by a light beam surrounded by the light rays 21 and 22 emitted from the first curved surface 5. That is, the second curved surface 6
Is "interfered" by the light beam emitted from the first curved surface 5 at the second focal plane 13.

That is, on the first focal plane 11, the image formed by the first curved surface is regarded as “interference” by the light beam emitted from the second curved surface 6.
In contrast, the image formed by the second curved surface 6 at the second focal plane 14 is subjected to “interference” by the light beam emitted from the first curved surface 5.

The present invention is based on the above-described knowledge, and is intended to prevent the image formed by the second curved surface 6 from being "interfered" by the light beam exiting the first curved surface 5 at the second focal plane 14. It is. For this, the first curved surface 5
By forming the dimming means for reducing the amount of light transmitted through the entire surface of the first surface, a part of the first curved surface 5 including the optical axis 10, or a part of the first curved surface 5 and the second curved surface 6, This eliminates the fact that the image formed by the two curved surfaces 6 is “interfered” by the light beam emitted from the first curved surface 5.

In FIG. 29, the object point J (not shown) at infinity has been described as an example. However, as described below with reference to FIGS. 31 to 33, the object has a finite size. The invention of the present application can be similarly applied to the case where the present invention is provided.

FIGS. 31 to 33 show an object point J on the optical axis 10.
1 shows a case where an object is between two points 1 and an object point J2 outside the optical axis 10. In FIG. 31, the object point J1 of the optical axis 10 is formed by the first curved surface 5 as an image forming plane (approximately the first focal plane 11).
The image is formed as an image point K1 above. On the first focal plane 11, an annular ring 2 surrounding the image point K1 by the second curved surface 6
5 are formed. On the first focal plane 11, the annular ring 25 does not interfere with the image point K1.

The object point J1 of the optical axis 10 is
As a result, an image is formed as an image point L1 on an imaging plane (approximately the second focal plane 13). On the second focal plane 13, a disk 26 made of the background light is formed by the first curved surface 5, and the image point L <b> 1 is swallowed in the disk 26 and the image point L
1 is interfered by the disk 26.

In FIG. 32, an object point J2 outside the optical axis 10 is formed as an image point K2 on the image forming plane (approximately the first focal plane 11) by the first curved surface 5. On the first focal plane 11, an elliptical ring 27 surrounding the image point K2 is formed by the second curved surface 6. On the first focal plane 11, the elliptical ring 27 does not interfere with the image point K2.

The object point J2 outside the optical axis 10 is formed as an image point L2 on the image forming plane (approximately the second focal plane 13) by the second curved surface 6. On the second focal plane 13,
An elliptic plate 28 made of background light is formed by the first curved surface 5, and the image point L2 is buried in the elliptical plate 28,
The image point L2 is interfered by the elliptical plate 28.

As shown in FIG. 33, the object point J1 and the object point J2
The image of the object formed between the two points is obtained by superimposing the image point shown in FIG. 31 and the image point shown in FIG. As can be seen from FIG. 33, on the first focal plane 11, the image points K1 and K
The image formed between the two is not interfered by the annular ring 25 nor the elliptical annular ring 27. On the other hand, on the second focal plane 13, the image formed between the image point L1 and the image point L2 is swallowed by the disk 26 and the elliptical plate 28, and The plate 28 is receiving interference.

That is, as shown in FIG.
Even if the object has a finite size, or if the object is not an infinite circle but at a finite distance from the front curve 2, the present invention will be described with reference to FIG. The same can be said.

If the size of the object becomes too large, the image point K1 is interfered by the elliptical ring 27 on the first focal plane 11, and the image point K2 is changed to the ring 25.
May cause interference. However, even in that case, according to the present invention, it is possible to partially prevent the image formed by the second curved surface 6 from being "interfered" by the light beam emitted from the first curved surface 5 in the second focal plane 13. It is possible.

Referring to FIGS. 31 to 33 and FIG. 29, an example in which the first curved surface 5 is formed from the near portion curved surface N and the second curved surface 6 is formed from the far portion curved surface F will be described. The present invention has been described above. However, the present invention is not limited to this, and similarly, as shown in FIG. 30, the first curved surface 5 is formed from the far portion curved surface F and the second curved surface 6 is formed from the near portion curved surface N. To establish.

According to the present invention, since the dimming means for reducing the amount of light transmitted through the central curved surface region is formed in the central curved surface region, the image formed by the second curved surface 6 on the second focal plane 13 is formed by the first curved surface region. It is possible to avoid "interference" due to the light beam emitted from the curved surface 5, to form a clear image, and to obtain a clear visual acuity.

Further, since the size of the dimming means can be formed so as to change the dimming rate according to the size of the pupil, it is possible to set an appropriate dimming means in accordance with each case. it can.

[0039]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. First, a first embodiment of the present invention will be described. In the present embodiment, FIG.
As shown in FIG. 1, the contact lens 1 shown in FIG.

In FIG. 1, a front curve 2 of the contact lens 1 has a first curved surface 5 formed of a near portion curved surface N at a center portion including the optical axis, and a first curved surface N which is adjacent to the outside of the first curved surface 5. A second curved surface 6 composed of the used part curved surface F is formed. That is, in the contact lens 1 shown in FIG. 1, the front curve 2 has one near portion curved surface N and one far portion curved surface F.

When the optical axis 10 of the contact lens 1 is fitted so as to coincide with the center of the pupil of the eye, a ray incident parallel to the optical axis 10 as an image ray of an object at infinity is considered.

In FIG. 2, the contact lens 1 is formed by a base curve 2 and a front curve 3, and the front curve 3 is formed by a near portion N and a far portion F concentrically with respect to the optical axis 10. ing. A curved surface including the optical axis 10 is defined as a first curved surface 5, and a curved surface adjacent to the outside of the first curved surface 5 is defined as a second curved surface 6. In the example shown in FIG. 2, the first curved surface is configured by the near portion curved surface N, and the second curved surface 6 is configured by the far portion curved surface F.

A thin film for reducing the amount of light transmitted through the central curved surface region on the central curved surface region defined on the front curve 2 with a predetermined radius as the radius around the intersection O between the front curve 2 and the optical axis 10. A dimming means 8 is formed.

In FIG. 2, it is assumed that an object point J (not shown) is located at an infinite distance from the front curve 2, and an image point K of the object point J by a first curved surface and an image point L by a second curved surface are considered.

A first focal plane 11 (first imaging plane), which is an imaging plane related to the first curved surface 5, is a second focal plane 13 (second imaging plane), which is an imaging plane related to the second curved surface 6. It is closer to the front curve 2 than.

In FIG. 2, the central curved surface area in which the dimming means 8 is formed is defined in a part of the first curved surface 5 with the intersection O as the center.

The light rays 21 and 22 emitted from the first curved surface 5 composed of the near portion curved surface N are condensed and imaged on the first focal point 12 on the first focal plane 11 as an image point K, and thereafter diverge. It reaches the second focal plane 13. Further, the light rays 23 and 24 emitted from the second curved surface 6 composed of the distance portion curved surface F are formed into an annular light flux surrounded by the light rays 23 and the light rays 24 so as to form the second focal point 1 on the second focal plane 13.
The light is condensed and formed as an image point L at 3.

As can be seen from FIG. 2B, the first curved surface 5
Is surrounded by an annular ring 25 formed on the first focal plane 11 by a light beam surrounded by light rays 23 and 24 emitted from the second curved surface 6, and the image point K is 25, that is, the image point K of the first curved surface 5 is not overlapped with the first focal plane 1
1 "interference" due to the light beam emitted from the second curved surface 6
It will not be done.

On the other hand, the image point L by the second curved surface 6 is
On the second focal plane 13, it overlaps with the disk 26 composed of the background light formed by the luminous flux surrounded by the light rays 21 and 22 emitted from the first curved surface 5, that is, the image point L by the second curved surface 6 is At the bifocal plane 13, the light beam emitted from the first curved surface 5 can be “interfered”.

However, the dimming means 8 is located in the central curved surface area.
Is provided, the amount of light in the region 9 indicated by oblique lines in FIG. Therefore, on the second focal plane 13, the disc 2 composed of the background light
6 is reduced, and it is possible to prevent the image point L from being “interfered” by the light beam emitted from the first curved surface 5. In the first focal plane 11, the amount of light at the image point K is dimmed. However, when the degree of dimming is low, for example, when the dimming is within about 15% like a normal spectacle lens, it is reduced. The effects of light can be neglected.

When the reducing means 8 is formed at a part of the center of the first curved surface 5 as shown in FIG. 2A, the reducing means 8 is a metal film which completely blocks light transmission. It is also possible to employ shielding means such as.

FIG. 3 shows a case where the central curved surface area is defined over the entire area of the first curved surface 5 centering on the intersection O, and the dimming means 8 is formed on the entire first curved surface 5.

FIG. 4 shows a case where the central curved surface region is defined by the entire area of the first curved surface 5 and a part of the second curved surface 6 with the intersection O as the center. 6 is formed in the range protruding.

As described above, when the dimming means 8 is formed at a part of the center of the first curved surface 5 as shown in FIG. 2, the entire first curved surface 5 is dimmed as shown in FIG. Even when the means 8 is formed, or when the dimming means 8 is formed over the entire first curved surface 5 and a part of the second curved surface 6 as shown in FIG. The light quantity of the disk 26 composed of the background light is reduced, so that it is possible to prevent the image point L from "interfering" with the light beam emitted from the first curved surface 5.

Next, a second embodiment of the present invention will be described with reference to FIG. 5, FIG. 6, and FIG. The contents described with reference to FIG. 29 are, as described above, when the distance portion curved surface F is formed on the first curved surface 5 and the near portion curved surface N is formed on the second curved surface 6 as shown in FIG. Can also be applied. Therefore,
The invention of the present application is also valid in the case where the far curved surface F is formed on the first curved surface 5 and the near curved surface N is formed on the second curved surface 6. This embodiment is an example corresponding to FIG. 30 when the first embodiment corresponds to FIG.

That is, the examples shown in FIG. 5, FIG. 6 and FIG. 7 are the cases where the far curved surface F is formed on the first curved surface 5 and the near curved surface N is formed on the second curved surface 6. 2, FIG. 3 and FIG. In the examples shown in FIGS. 5, 6, and 7, unlike the examples shown in FIGS. 2, 3, and 4, the first focal plane 11 is the F focal plane of the distance portion curved surface F, so The second focal plane 13 is located at a distance from the front curve 2 because the second focal plane 13 is the N focal plane of the near portion curved surface N.

The image point L due to the near portion curved surface N can be interfered by the disk 26 made of the background light on the second focal plane 13. However, as in the case of FIGS. 2, 3 and 4, by providing the dimming means 8 in the central curved surface region, the light passing through the region 9 is dimmed, and the image point L is moved away from the distance portion curved surface F. It is possible to avoid interference by the light beam emitted from the first curved surface 5.

Next, a third embodiment of the present invention will be described with reference to FIGS. 8, 9, 10 and 11.
In the present embodiment, the contact lens 1 shown in FIG.
This is an example in which the dimming means 8 is provided in the central curved surface area as shown in FIG.

In FIG. 8, the front curve 2 of the contact lens 1 has a near portion curved surface N1 at the center including the optical axis.
A first curved surface 5 is formed, and a second curved surface 6 formed of a distance portion curved surface F1 is formed adjacent to the outside of the first curved surface 5, and a near portion curved surface N2 is formed outside the second curved surface 6. , N3
.. and the far portion curved surfaces F2, F3... Are alternately formed. That is, in the contact lens 1 shown in FIG.
The front curve 2 has a plurality of near portion curved surfaces N1, N2,... And a plurality of far portion curved surfaces F1, F2,.

FIG. 9 shows a case where the dimming means 8 is formed at a part of the center of the first curved surface 5, FIG. 10 shows a case where the dimming means 8 is formed over the entire first curved surface 5, FIG. 11 shows a case where the dimming means 8 is formed over the entire first curved surface 5 and a part of the second curved surface 6.

Also in these cases, the second focal plane 13
The light amount of the disk 26 (not shown) made of the background light is reduced in the above, and it is possible to avoid that the image point L by the second curved surface 6 is interfered by the light beam emitted from the first curved surface 5.

In the present embodiment, the ratio of the range of the central curved surface area where the dimming means 8 is formed to the entire curved surface area of the front curve 2 is small. Therefore, for example, in the case shown in FIG. 10, it is possible to set the filter density of the dimming means 8 to be considerably high.
That is, even if the filter density of the dimming means 8 is set to be very high, the light flux transmitted through the near portion curved surface N2, etc. in FIG. 10 is not dimmed, and is too dark to obtain the image point K by the near portion curved surface. On the other hand, on the other hand, the light amount of the disk 26 (not shown) made of the background light can be significantly reduced on the second focal plane 13, and the second curved surface 6
, The degree of interference of the image point L by the light beam emitted from the first curved surface 5 can be significantly reduced.

FIG. 11 shows an example in which the dimming means 8 is formed so as to extend over a part of the second curved surface 6 composed of the far portion curved surface F1. May be formed over the entire surface of the second curved surface 6 formed of the second curved surface 6, or may be formed over the far-distance portion curved surface N2, etc. outside the second curved surface 6.

Next, a fourth embodiment of the present invention will be described with reference to FIG. 12, FIG. 13 and FIG. FIG.
The examples shown in FIG. 2, FIG. 13 and FIG. 14 are the cases where the far portion curved surface F1 is formed on the first curved surface 5 and the near portion curved surface N1 is formed on the second curved surface 6 as shown in FIG. 9, FIG. Corresponds to 11. Also in the present embodiment, the near portion curved surfaces N1, N2.
The image point L can be interfered by the disc 26 made of the background light on the second focal plane 13 as shown in FIGS.
Also, as in the case of FIG. 11, by providing the dimming means 8 in the central curved surface region, the light passing through the region 9 is dimmed, and the image point L is interfered by the light flux emitted from the first curved surface 5. Can be avoided.

Next, FIG. 15, FIG. 16, FIG. 17, and FIG.
Referring to FIG. 8, a fifth embodiment of the present invention will be described. In the present embodiment, the contact lens 1 shown in FIG.
In this example, the dimming means 8 is provided in the central curved surface area as shown in FIG.

In FIG. 15, a contact lens 1 is an example of a basic type of a concentric progressive multifocal contact lens. In the front curve 2 of the contact lens 1, the central portion including the optical axis 10 is formed from the near portion region (N), the intermediate portion is formed from the progressive portion region (P), and the peripheral portion is formed from the far portion portion region (F). I have.

The first curved surface 5 is formed from the near portion curved surface N, and the second curved surface 6 is formed from the progressive portion curved surface P.
Note that the progressive surface P is not the distance portion itself,
In the sense that the first curved surface 5 is located outside the near portion curved surface N, it is regarded as a kind of far portion curved surface. It is also possible to consider that the second curved surface 6 is formed by the progressive portion curved surface P and the far portion curved surface F.

The focal plane of the near zone (N) is set to the first focal plane 1
1 and the focal plane of the progressive portion area (P) is the second focal plane 13a.
And the focal plane of the distance portion area (F) is the second focal plane 13b.

The image point of the near portion area (N) is K, the image point of the progressive portion area (P) is M, and the image point of the far portion area (F) is L.

As shown in FIG. 16B, the first focal plane 1
In 1, the image point K of the near portion area (N) is an annular ring 25a composed of background light of the progressive portion area (P).
Also, no interference is caused by the annular ring 25b composed of the background light from the distance portion area (F). On the other hand, in the second focal plane 13a, the image point M in the progressive portion area (P) is interfered by the disk 26a composed of the background light in the near portion area (N), while the far point area (F) ) Are not interfered by the annular ring 25b composed of the background light. In the second focal plane 13b, the image point L in the distance portion area (F) is interfered by the disk 26a composed of the background light in the near portion area (N), while the progressive portion area (P). No interference is caused by the annular ring 25a composed of the background light due to.

Therefore, in this embodiment, the dimming means 8 is formed at a part of the center of the first curved surface 5 as shown in FIG. Thereby, in the second focal plane 13a or the second focal plane 13b, it is possible to reduce the interference by the disk 26a composed of the background light due to the near portion area (N).

Similarly, the dimming means 8 is formed on the entire first curved surface 5 as shown in FIG. This also allows the second focal plane 13a or the second focal plane 13b to have the disk 26a composed of the background light from the near portion area (N).
Can be reduced.

As shown in FIG. 18, the dimming means 8 is formed over the entire first curved surface 5 and a part of the second curved surface 6. Thereby, in the second focal plane 13a or the second focal plane 13b, it is possible to reduce the interference by the disk 26a composed of the background light due to the near portion area (N).

Next, a sixth embodiment of the present invention will be described with reference to FIGS. 19, 20 and 21. FIG.
The examples shown in FIGS. 9, 20 and 21 are the cases where the far curved surface F is formed on the first curved surface 5 and the progressive curved surface P is formed on the second curved surface 6, respectively, as shown in FIGS. 16, 17 and 18, respectively. Corresponding to In this embodiment, the same effects as in the fifth embodiment can be obtained.

Next, with reference to FIGS. 22, 23 and 24, a method of manufacturing the contact lens 1 according to the present invention having the dimming means 8 will be described. Light transmitting portion 51 and light non-transmitting portion (or light semi-transmitting portion) 5 having the same axis.
2 and a bar member (or button) 50 for processing contact lenses as shown in FIG.
From 0, a contact lens having a desired shape is produced by a normal cutting method. Light opaque part (or light translucent part)
The light reducing means 8 is formed by 52.

The production of the bar material (or button) 50 is usually carried out through a two-stage polymerization. First, a monomer mixture comprising a polymerizable monomer component used as a contact lens material is polymerized using a cylindrical test tube to produce a columnar light-transmitting copolymer cylinder 53 as shown in FIG.

Further, a through hole having a diameter of 0.5 to 4 mm is formed in the center of the copolymerized cylindrical body 53 by using a drill or the like.
A copolymer cylinder 54 as shown in FIG.

Next, the copolymer cylinder 54 is placed in a test tube or the like, and then a monomer mixture obtained by adding an amount of dye or pigment necessary for light shielding or dimming to the same polymerizable monomer component is poured into the through hole. After filling, polymerization is carried out. As a result, a contact lens processing bar 50 having a light transmitting portion 51 and a light non-transmitting portion (or a light semi-transmitting portion) 52 having the same axis as shown in FIG. 22 is obtained.

The method for manufacturing the bar member 50 for processing a contact lens as shown in FIG. 22 can also be obtained by the following method.

First, a monomer mixture obtained by adding a dye or a pigment in an amount sufficient to block or diminish light to the polymerizable monomer component is polymerized in a cylindrical test tube, and a columnar light opaque is obtained. To produce a copolymer that is transmissive or translucent to light. Next, the overlapped cylindrical body 53 is cut into a desired diameter of 0.5 to 4 mm. Next, the columnar body processed to the desired diameter is placed in a test tube, and the periphery thereof is filled with a monomer mixture composed of the same polymerizable monomer component, followed by polymerization.

Next, as another method of manufacturing the contact lens provided with the dimming means 8, a desired portion including the optical center of the completed lens is formed with a diameter of 0.5 to 0.5 mm by using an ink jet device.
It may be performed by printing a 1 mm circle. Using this method, unlike the above two methods, it is possible to print a circle that is a selective light opaque or translucent portion on either the inner or outer surface of the finished lens.

As described above, since the neutral density element at the center of the lens including the optical axis can be provided at the time of lens polymerization, a large quantity of neutral density filters having a uniform diameter and density can be manufactured. In addition, an element having a high dimming rate can be provided by dyeing in a post-process after the formation of the lens shape. Also, the density, size, and color of the neutral density filter can be custom designed.

Next, specific examples of the present invention will be described below. The numerical values used here are the light-blocking rate or the dimming rate and the interference rate at the visual axis of the retina when the sum of the refractive power of the contact lens and the refractive power of the eye is 55.64 diopters and the addition is 2 diopters. Was calculated.

In the following description, each term has the following content. "ND light attenuation rate (%)"
The light transmittance of the dimming means 8 as a neutral density filter (ND) is shown.

The term “dimming rate at N focus (%)” or “dimming rate at F focus (%)” refers to the dimming means 8 on the first focal plane 11 where the problem of “interference” does not occur. Is an amount indicating the extent to which inherently undesirable dimming is caused by the provision of.

The “interference rate at F focus (%)” or “interference rate at N focus (%)” refers to the image point by the second curved surface 6 on the second focal plane 13 where the problem of “interference” occurs. L is a quantity indicating the degree of “interference” received by the disk 26 due to the background light passing through the first curved surface 5. Where "interference rate"
Is formed as follows. It is assumed that the size of the image point L by the second curved surface 6 has an area of 3 μm in diameter in consideration of the size of the photoreceptor cells, and that the predetermined unit light amount is condensed on the area of 3 μm in diameter, and the image brightness per unit area Is calculated. on the other hand,
The area of the disk 26 due to the background light on the second focal plane 13 where "interference" is a problem is determined, and the background brightness is calculated assuming that a predetermined unit light amount is distributed to the disk area. And
The “interference rate” is obtained as a ratio of the background brightness of the image brightness.

The “ND interference radius” indicates a radius of the disk 26 formed on the second focal plane 13 as background light by a light beam passing through the first focal plane 5.

The central zone 1 (1Z) indicates the zone of the first curved surface 5, and the peripheral zone 2 (2Z) indicates the zone of the second curved surface 6. Three zones (3Z) indicate zones adjacent to the outside of two zones (2Z), and four zones (4Z) indicate zones adjacent to the outside of three zones (3Z).

Examples will be shown below with reference to specific numerical values. (1) Example 1 The central zone 1 zone (1Z) is a near zone area of 1 mm, the peripheral zone 2 (2Z) is a far zone zone of 1 mm, and the diameter of the dimming element (ND) as the dimming means 8 is 1 mm. An example of a concentric bifocal lens of 1 mm (a dimming element diameter is smaller than 1Z) will be described.

In the following examples shown in Tables 1 to 6,
A case is shown in which two zones 1Z and 2Z are provided, one zone (1Z) at the center has a zone width of 1 mm, and two zones (2Z) at the periphery have a zone width of 1 mm.

[0091]

[Table 1] As shown in Table 1, when ND = 0% (there is no dimming element), the dimming rate of the near portion focal point in the central one zone is 0%, and the peripheral portion due to the near portion luminous flux in the central one zone. The interference rate of the two zones with respect to the distance portion focal point is 0.25%, and the interference range of the distance portion focal plane due to the dimming element is 0 mm. On the other hand, as the dimming density of the dimming element is increased, the dimming rate increases at the near focal point, but conversely, at the far focal point, it is caused by the near partial light flux in the central one zone. The interference rate of the two peripheral zones with the distance focus is reduced. Further, the interference range of the dimming element on the focal plane of the distance portion is uniquely determined by the diameter of the dimming element and has a constant value.

The filter density of a general contact lens is 15%. That is, the contact lens has a light reduction rate of 15% due to various reasons such as fashionability.
The degree is acceptable. Therefore, assuming that the allowable value of 15% is the limit value of the dimming rate, in this example, the filter density of the dimming element is 60%. When the filter density of the dimming element is set to 60%, the dimming rate of the near focal point in the central one zone is 15%, which is an allowable range.

As a result of calculation according to the above-described calculation method, the interference rate between the near zone light flux in the central one zone and the far zone focus in the peripheral two zones is 0.1%, and the interference ratio at the far zone focal plane is 0.1%. The interference range of the dimming element is 0.017 mm.

Therefore, at the focal point of the distance portion in the peripheral two zones, the light is not reduced by the light reducing element, and
The interference rate due to the near luminous flux of the zone was reduced by 48%.
Here, 48% means that the filter density of the darkening element is 60%.
% And 0.15% when no light reducing element is used, that is, 0.25% when the filter density of the light reducing element is set to 0%. Is the amount obtained by comparing the degree of reduction.

Further, if the sunglass effect is expected, that is, the contact lens is assumed to be worn as sunglasses, and the degree of dimming allowed for the contact lens is increased. In this case, for example, the filter density of the contact lens can be set to 50%. Assuming that this value is a limit value, in the case of this example, the density of the light reducing element is 100%.
At this time, the dimming rate of the near portion focal point in the central one zone is 25.
%, The interference ratio of the near zone light flux in the central zone 1 to the far zone focal point in the peripheral two zones is 0%, and the interference range of the dimming element on the far zone focal plane is 0.017 mm. Therefore,
At the distance focal point in the peripheral two zones, 100% of the interference rate due to the near light in the central one zone could be avoided without being dimmed by the dimming element.

(2) Example 2 The central zone 1 zone (1Z) has a near area of 1 mm, the peripheral 2 zones (2Z) have a distance area of 1 mm, and a dimming element (N
An example of a concentric bifocal lens D) having a diameter of 2 mm (the dimming element diameter is the same as 1Z) is shown.

[0097]

[Table 2] As shown in Table 2, when ND = 0% (there is no dimming element), the dimming rate of the near portion focal point in the central one zone is 0%, and the peripheral portion due to the near portion luminous flux in the central one zone. The interference rate of the two zones with respect to the distance portion focal point is 0.25%, and the interference range of the distance portion focal plane due to the dimming element is 0 mm. On the other hand, as the dimming density of the dimming element is increased, the dimming rate increases at the near focal point, but conversely, at the far focal point, it is caused by the near partial light flux in the central one zone. The interference rate of the two peripheral zones with the distance focus is reduced. Further, the interference range of the dimming element at the focal plane of the distance portion is uniquely determined by the diameter of the dimming element and has a constant value.

Since the filter density of a general contact lens is 15%, taking this value as a limit value, in the case of this example, the density of the dimming element is 10%. At this time, the dimming rate of the near focus in the central zone 1 zone is 10%,
The interference rate of the near portion luminous flux of the zone to the far portion focal point of the two peripheral zones is 0.23%, and the interference range of the dimming element on the far portion focal plane is 0.035 mm. Therefore, at the distance focus at the peripheral two zones, the interference rate of the near portion light flux at the central one zone could be reduced by 8% without being dimmed by the dimming element.

Further, if a sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the dimming element is 50% in this example. At this time, the extinction ratio of the near portion focal point in the central one zone is 50%, the interference rate of the near portion luminous flux of the central one zone to the far portion focal point in the peripheral two zones is 0.13%,
The interference range of the dimming element at the distance focal plane is 0.035 mm
It is. Therefore, at the distance focus at the peripheral two zones, the interference rate due to the near portion light flux at the central one zone could be reduced by 48% without being dimmed by the dimming element.

(3) Example 3 One zone (1Z) in the central part is a near portion area, two zones (2Z) in a peripheral portion are a far portion region, and the diameter of the dimming element (ND) = 3 m
An example of a concentric bifocal lens made of m (the dimming element diameter is larger than 1Z) is shown.

[0101]

[Table 3] As shown in Table 3, when ND = 0% (there is no dimming element), the dimming rate of the near portion focal point in the central one zone is 0%, and the peripheral portion due to the near portion luminous flux in the central one zone. The interference rate of the two zones with respect to the far portion focal point is 0.25%, and the interference range of the dimming element on the far portion focal plane is 0 mm. On the other hand, as the density of the dimming element is increased, the dimming rate increases at the near focus. On the other hand, at the distance focus, the interference rate due to the near portion light flux in the central one zone decreases at the distance focus of the peripheral two zones, as in Table 2, but on the contrary, the dimming rate increases.
Further, the interference range of the dimming element at the focal point of the distance portion is uniquely determined by the diameter of the dimming element and has a constant value.

Since the filter density of a general contact lens is 15%, taking this value as a limit value, in this example, the density of the dimming element is 10%. At this time, the dimming rate of the near focal point in the central zone 1 zone is 10%, and the peripheral portion 2
The extinction rate of the far focus of the zone is 4.17%, the interference rate of the near luminous flux of the central one zone to the far focus of the peripheral two zones is 0.23%, and the far focus is The interference range of the dimming element at the focal point is 0.035 mm. Therefore, at the distance focal point of the peripheral two zones, the light dimming element causes 4.1.
Although the dimming is performed by 7%, the interference rate of the near zone light flux in the central one zone to the focal point in the far zone in the peripheral two zones can be reduced by 8%.

Further, if a sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, in this example, the density of the dimming element is 50%. At this time, the dimming rate on the near focal point in the central zone 1 is 50%, and the interference rate of the near luminous flux of the central zone 1 on the far focal point in the peripheral two zones is 0.13.
%, And the interference range of the dimming element at the focal plane of the distance portion is 0.1%.
035 mm. Therefore, at the far focus in the peripheral two zones, the light is dimmed by 20.83% by the dimming element, but the interference rate by the near light in the central one zone is reduced by 48%.
Could be reduced.

(4) Example 4 One zone (1Z) in the central part has a distance area of 1 mm, the two zones (2Z) in the peripheral area have a near area of 1 mm, and the dimming element (N
An example of a concentric bifocal lens D) having a diameter of 1 mm (a dimming element diameter smaller than 1Z) is shown.

[0105]

[Table 4] As shown in Table 4, when ND = 0% (there is no dimming element), the dimming rate of the far portion focal point in the central one zone is 0%, and the peripheral portion due to the far portion luminous flux in the central one zone. The interference rate of the two zones with the near focus is 0.22%, and the interference range of the near focus with the dimming element is 0 mm. On the other hand, as the density of the dimming element is increased, the dimming rate is increased at the focal point for the distance portion. The interference rate to the peripheral two-zone near focus is reduced. In addition, the interference range of the dimming element at the near focal point is uniquely determined by the diameter of the dimming element and has a constant value.

Since the filter density of a general contact lens is 15%, taking this value as a limit value, in this example, the filter density of the dimming element is 60%. At this time, the extinction rate of the focal point in the far zone in the central zone is 15
%, The interference rate of the distant part light beam of the central one zone to the near focal point of the peripheral two zones is 0.09%, and the interference range of the dimming element at the near focal point is 0.019 mm. Therefore, at the near focal point in the two peripheral zones, the interference rate due to the distant light beam in the central one zone could be reduced by 59% without being dimmed by the dimming element.

Further, if a sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, in this example, the density of the dimming element is 100%. At this time, the extinction rate of the far portion focus in the central one zone is 25%, the interference rate of the far portion luminous flux in the central one zone to the near focus in the peripheral two zones is 0%, and the far portion focus. The interference range of the dimming element at the focal point is 0.019 mm. Therefore, at the near focal point of the two peripheral zones, 100% of the interference rate due to the distant light flux in the central one zone could be avoided without being dimmed by the dimming element.

(5) Example 5 One zone (1Z) in the central part has a distance portion of 1 mm, the two zones (2Z) in the peripheral portion have a near portion region of 1 mm, and the dimming element (N
An example of a concentric bifocal lens D) having a diameter of 2 mm (the dimming element diameter is the same as 1Z) is shown.

[0109]

[Table 5] As shown in Table 5, when ND = 0% (there is no dimming element), the extinction rate of the far portion focal point in the central one zone is 0%, and the peripheral portion due to the far portion luminous flux in the central one zone. The interference rate of the two zones with the near focus is 0.22%, and the interference range of the near focus with the dimming element is 0 mm. On the other hand, as the density of the dimming element is increased, the dimming rate is increased at the distance focus, but conversely, at the near focus, the light is reduced by the distance light in the central zone. The interference rate of the two peripheral zones to the near focus is reduced. Further, the interference range of the dimming element at the focal point of the distance portion is uniquely determined by the diameter of the dimming element and has a constant value.

Since the filter density of a general contact lens is 15%, taking this value as a limit value, in the case of this example, the density of the dimming element is 10%. At this time, the extinction rate of the focal point in the far zone in the central zone is 10%,
The interference rate of the far-distance luminous flux of the zone to the near focal point of the two peripheral zones is 0.19%, and the interference range of the dimming element at the near focal point is 0.037 mm. Therefore, the peripheral part 2
At the near focal point of the zone, the interference rate due to the distant light beam in the central one zone could be reduced by 13.6% without being dimmed by the dimming element.

Further, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, in this example, the density of the light reducing element is 50%. At this time, the extinction ratio of the far portion focal point in the central one zone is 50%, the interference rate of the near portion luminous flux in the central one zone to the near focal point in the peripheral two zones is 0.11%,
The interference range of the dimming element at the near focal point is 0.037 mm. Therefore, at the near focus of the peripheral two zones,
The interference rate due to the luminous flux of the far portion in the central one zone could be reduced by 50% without being dimmed by the dimming element.

(6) Example 6 One zone (1Z) at the center portion is a distance portion region, two zones (2Z) at a peripheral portion are near portion portions, and the diameter of the dimming element (ND) is 3 m.
An example of a concentric bifocal lens made of m (the dimming element diameter is larger than 1Z) is shown.

[0113]

[Table 6] As shown in Table 6, when ND = 0% (there is no dimming element), the dimming rate of the far portion focal point in the central one zone is 0%, and the peripheral portion due to the far portion luminous flux in the central one zone. The interference rate of the two zones with the near focal point is 0.22%, and the interference range of the dimming element at the near focal point is 0 mm. On the other hand, as the density of the light dimming element is increased, the dimming rate is increased at the focal point of the distance portion. On the other hand, at the near portion focus, the interference rate due to the far portion luminous flux in the central one zone decreases as in Table 5, but conversely, the dimming rate increases. In addition, the interference range of the dimming element at the near focal point is uniquely determined by the diameter of the dimming element and has a constant value.

Since the filter density of a general contact lens is 15%, taking this value as a limit value, in the case of this example, the density of the light reducing element is 10%. At this time, the extinction rate of the far-area focal point in the central zone 1 zone is 10%, and the peripheral area 2
The dimming rate of the near focal point of the zone is 4.17%, the interference rate of the near luminous flux of the central one zone to the near focal point of the peripheral two zones is 0.19%, and the near focal point The interference range of the dimming element at the focal point is 0.037 mm. Therefore, at the near focal point of the peripheral two zones, 4.1 is set by the dimming element.
Although the dimming is performed by 7%, the interference rate of the luminous flux of the far zone in the central zone to the focal point in the near zone of the second zone can be reduced by 13.6%.

Further, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, in this example, the density of the dimming element is 50%. At this time, the extinction rate of the far portion focal point in the central one zone is 50%, the interference rate of the far portion luminous flux of the central one zone to the near focal point in the peripheral two zones is 0.13%,
Further, the interference range of the dimming element on the focal plane for the near portion is 0.03.
7 mm. Therefore, at the near focal point of the peripheral two zones, the light is dimmed by 20.83% by the dimming element.
The interference rate due to the luminous flux in the far zone in the central zone was reduced by 50%.

(7) Example 7 One zone (1Z) in the central part is the near area (N1), two zones (2Z) in the peripheral area are the far area (F1), and three zones (3Z) in the peripheral area are near. Area (N2), peripheral 4 zones (4
Z) shows an example of a multiple concentric bifocal lens in which the distance portion area (F2) and the diameter of the dimming element (ND) are 1 mm (the dimming element diameter is smaller than 1Z).

In the examples shown in Tables 7 to 12, the zones have four zones of 1Z, 2Z, 3Z and 4Z, one zone (1Z) at the center has a zone width of 1 mm, and 0.75mm in 2 zones (2Z) toward the part
This shows a case where three zones (3Z) have a zone width of 0.50 mm and four zones (4Z) have a zone width of 0.50 mm.

[0118]

[Table 7] As shown in Table 7, when ND = 0% (there is no dimming element), the dimming rate (N12) of the focal point composed of the central zone 1 zone and the 3 zone near zone (N1) is 0%, Peripheral 2 zones and 4 by luminous flux in near portion area (N1) of central 1 zone
The interference ratio (F12) to the focal point, which consists of the far-field portions (F1 and F2) of the zone, is 0.17%. On the other hand, as the dimming density of the dimming element is increased, the dimming rate (N1) of the focal point composed of the near zone (N1) in the central one zone increases at the near focal point. The dimming rate (N2) of the focal point composed of the near zone (N2) of the three peripheral zones is 0%.
Therefore, the dimming rate (N12) of the focal point composed of the near zone (N1 and N2) of the central zone 1 and the peripheral zone 3 gradually increases. Further, in the distance portion focal point, an interference rate (F12) of the light flux of the near portion portion region (N1) of the central one zone to the focal point composed of the peripheral portion two zones and the four zone far portion portions (F1 and F2). Decreases.

Here, the dimming rate allowed for the contact lens is not the dimming rate (N1) of the focal point composed of the near zone (N1), but the near zone of one zone and three peripheral zones. (N1 and N2) total extinction ratio (N
Consider whether 12) is within the allowable range.

Since the filter density of a general contact lens is 15%, if this value is set as a limit value, in this example, the light reduction rate (N12) is allowed up to 15%. The filter density of the device may be 100%.

At this time, the extinction rate (N12) of the focal point composed of the near zone (N1 and N2) of the central zone 1 and the peripheral zone 3 is 8.3%, and the near zone of the central zone 1 is 8.3%. The interference rate (F1) of the luminous flux of (N1) to the focal point composed of the far zone (F1 and F2) of 2 zones and 4 zones in the peripheral area
2) is 0%. Therefore, at the focal point composed of the far zone portions (F1 and F2) of the peripheral two zones and the four zones, the luminous flux of the near zone portion (N1) of the central one zone is not reduced by the dimming element. Interference rate (F12) is 1
00% avoided.

Further, if a sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the dimming element is 100% in this example. At this time, the central part 1 zone and the peripheral part 3
The extinction ratio (N12) of the focal point composed of the near zone regions (N1 and N2) of the zone is 8.3%, and the peripheral zone 2 zone and the 4 zone zone due to the luminous flux of the near zone (N1) of the central zone 1 zone. The interference rate (F1) at the focal point composed of the far vision areas (F1 and F2)
2) is 0%. Therefore, at the focal point composed of the far zone portions (F1 and F2) of the peripheral two zones and the four zones, the luminous flux of the near zone portion (N1) of the central one zone is not reduced by the dimming element. Interference rate (F12) is 1
00% avoided.

(8) Example 8 One zone (1Z) in the central part is the near zone (N1), two zones (2Z) in the peripheral zone are the distance zone (F1), and three zones (3Z) in the peripheral zone are near. Area (N2), peripheral 4 zones (4
Z) shows an example of a multiple concentric bifocal lens in which the distance portion area (F2) and the dimming element (ND) have a diameter of 2 mm (the dimming element diameter is the same as 1Z).

One zone (1Z) at the center has a zone width of 1 mm, and two zones (2Z) toward the periphery have a width of 0.1 mm.
75mm zone width, 3 zones (3Z) 0.5
0 mm zone width, 4 zone (4Z) 0.50
mm zone width.

[0125]

[Table 8] As shown in Table 8, when ND = 0% (there is no dimming element), the dimming rate (N12) of the focal point including the central zone 1 zone and the near zone (N1) of 3 zones is 0%, Peripheral 2 zones and 4 by luminous flux in near portion area (N1) of central 1 zone
The interference ratio (F12) to the focal point, which consists of the far-field portions (F1 and F2) of the zone, is 0.17%. On the other hand, as the dimming density of the dimming element is increased, the dimming rate (N1) of the focal point composed of the near zone (N1) in the central one zone increases at the near focal point. The dimming rate (N2) of the focal point composed of the near zone (N2) of the three peripheral zones is 0%.
Therefore, the dimming rate (N12) of the focal point composed of the near zone (N1 and N2) of the central zone 1 and the peripheral zone 3 gradually increases. Further, in the distance portion focal point, an interference rate (F12) of the light flux of the near portion portion region (N1) of the central one zone to the focal point composed of the peripheral portion two zones and the four zone far portion portions (F1 and F2). Decreases.

Here, since the filter density of a general contact lens is 15%, if this value is set as a limit value, in this example, the filter density of the light reduction element is 40%. At this time, the extinction ratio (N1) of the focal point composed of the near zone (N1 and N2) of the central zone 1 and the peripheral zone 3
2) is 13.3%, the near zone area (N
The interference rate (F12) of the light flux of (1) to the focal point composed of the far-field portions (F1 and F2) of the peripheral two zones and the four zones is 0.08%. Therefore, at the focal point composed of the far zone portions (F1 and F2) of the peripheral two zones and the four zones, the luminous flux of the near zone portion (N1) of the central one zone is not reduced by the dimming element. Interference rate (F12) is 5
3% reduction.

Further, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the light reduction element is 100% in this example. At this time, the central part 1 zone and the peripheral part 3
The dimming rate (N12) of the focal point composed of the near zone areas (N1 and N2) of the zone is 33.3%, and the peripheral zone 2 zone and the 4 zone zone due to the luminous flux of the central zone 1 near zone (N1). The interference rate (F1) at the focal point composed of the far vision areas (F1 and F2)
2) is 0%. Therefore, at the focal point composed of the far zone portions (F1 and F2) of the peripheral two zones and the four zones, the luminous flux of the near zone portion (N1) of the central one zone is not reduced by the dimming element. Interference rate (F12) is 1
00% avoided.

(9) Example 9 One zone (1Z) in the central part is the near area (N1), two zones (2Z) in the peripheral area are the far area (F1), and three zones (3Z) in the peripheral area are near. Area (N2), peripheral 4 zones (4
Z) shows an example of a multiple concentric bifocal lens in which the distance portion area (F2) and the dimming element (ND) have a diameter of 3 mm (diameter of the dimming element is larger than 1Z).

One zone (1Z) at the center has a zone width of 1 mm, and two zones (2Z) toward the periphery have a width of 0.1 mm.
75mm zone width, 3 zones (3Z) 0.5
0 mm zone width, 4 zone (4Z) 0.50
mm zone width.

[0130]

[Table 9] As shown in Table 9, when ND = 0% (there is no dimming element), the dimming rate (N12) of the focal point composed of the central zone 1 zone and the near zone (N1) of 3 zones is 0%, Peripheral 2 zones and 4 by luminous flux in near portion area (N1) of central 1 zone
The rate of interference with the focal point, which consists of the zone of far vision (F1 and F2), is 0.17%. On the other hand, as the density of the light dimming element is increased, the dimming rate (N1) of the focal point composed of the near part area (N1) in the central one zone at the near focal point is obtained.
Is increased, but the extinction ratio (N2) of the focus composed of the near zone (N2) of the three peripheral zones is 0%. Therefore, the near portion area (N 1 zone) of the central 1 zone and the peripheral 3 zone
The extinction ratio (N12) of the focus consisting of 1 and N2) gradually increases. On the other hand, in the distance portion focus, the dimming rate (F1) of the focus formed by the distance portion region (F1) of the peripheral two zones increases, but the focus formed by the distance portion region (F2) of the four peripheral zones. Has an extinction ratio (F2) of 0%. Therefore, the peripheral portion 2 due to the luminous flux in the near portion region (N1) of the central portion 1 zone.
The interference rate to the focus consisting of the zone and the four zone far vision regions (F1 and F2) is reduced.

Since the filter density of a general contact lens is 15%, taking this value as a limit value, in this example, the filter density of the dimming element is 40%. At this time, the dimming rate of the near focus is 13.3%. On the other hand, at the distance portion focus, the distance portion region (F
The extinction ratio (F1) of the focus composed of 1) is 24.2%. Further, the interference rate of the light flux of the near portion area (N1) of the central one zone to the focal point formed by the peripheral two zones and the four far portion areas (F1 and F2) of the four zones is 0.1%. Therefore, the far vision area (F1
And F2), the interference rate due to the luminous flux in the near portion area (N1) in the central one zone could be reduced by 41%.

Further, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the light reduction element is 100% in this example. At this time, the dimming rate of the near focus (N1
2) is 33.3%. On the other hand, in the distance portion focus, the extinction rate (F1) of the focus formed by the distance portion region (F1) in the peripheral two zones is 60.6%, and the light flux in the near portion region (N1) in the central one zone. The interference rate with respect to the focal point composed of the far vision portions (F1 and F2) of the peripheral two zones and the four zones is 0%. Therefore, at the focal point composed of the far zone portions (F1 and F2) of the peripheral two zones and the four zones, the interference rate due to the light flux in the near zone (N1) of the central one zone could be avoided by 100%.

(10) Example 10 One zone (1Z) in the central part is a distance portion area (F1), two zones (2Z) in a peripheral portion are near portions (N1), and three zones in a peripheral portion (3Z) are distant portions. Area (F2), peripheral 4 zones (4
Z) shows an example of a multiple concentric bifocal lens in which the near portion area (N2) and the dimming element (ND) have a diameter of 1 mm (the dimming element diameter is smaller than 1Z).

One zone (1Z) at the center has a zone width of 1 mm, and two zones (2Z) toward the periphery have a width of 0.1 mm.
75mm zone width, 3 zones (3Z) 0.5
0 mm zone width, 4 zone (4Z) 0.50
mm zone width.

[0135]

[Table 10] As shown in Table 10, when ND = 0% (there is no dimming element), the far-vision area (F1) of the central 1 zone and the 3 zones
The extinction rate (F1) of the focal point composed of F0 is 0%, and the peripheral two zones by the luminous flux in the far vision area (F1) of the central one zone are 4%.
The interference (N12) at the focal point, consisting of the near zone (N1 and N2) of the zone, is 0.14%. On the other hand, as the density of the dimming element is increased, the extinction rate (F1) of the focus formed by the far-vision portion area (F1) in the central one zone increases at the far-vision focus. The dimming rate (F2) of the focal point, which is composed of the far vision area (F2) of the three peripheral zones, is 0%.
Therefore, the extinction rate (F12) of the focal point, which is composed of the far-vision area (F1 and F2) of the central zone 1 and the peripheral zone 3, gradually increases. In the near portion focus, an interference rate (N12) of the light flux of the far portion region (F1) of the central one zone to the focus formed by the peripheral portion 2 zones and the 4 zone near portion portions (N1 and N2). Decreases. Here, since the filter density of a general contact lens is 15%, taking this value as a limit value, in the case of this example, the filter density of the light reduction element is 100%. At this time, the extinction rate (F12) of the focal point, which is composed of the far zone portions (F1 and F2) of the center 1 zone and the peripheral 3 zones, is 8.3%, and the far zone portion (F1) of the center 1 zone. The interference rate (N12) to the focal point formed by the near zone (N1 and N2) of the peripheral two zones and the four zones by the light beam is 0%. Therefore, at the focal point composed of the near zone (N1 and N2) of the peripheral two zones and the four zones, the central portion 1 is not dimmed by the dimming element.
The interference rate (N1) due to the luminous flux in the distance portion area (F1) of the zone
2) could be avoided 100%.

If the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, in this example, the density of the dimming element is 100%. At this time, the central part 1 zone and the peripheral part 3
The extinction rate (F12) of the focal point composed of the far-field portions (F1 and F2) of the zone is 8.3%, and the peripheral two zones and the four zones due to the luminous flux of the far-field portion (F1) in the central one zone are used. The interference rate (N1) to the focus consisting of the near zone (N1 and N2)
2) is 0%. Therefore, at the focal point composed of the near zone (N1 and N2) of 2 zones and 4 zones at the peripheral portion, the light is not attenuated by the dimming element, but is generated by the luminous flux of the far zone (F1) of the center 1 zone. Interference rate (N12) is 1
00% avoided.

(11) Example 11 One zone (1Z) in the central part is a distance portion area (F1), two zones (2Z) in a peripheral portion are near portions (N1), and three zones in a peripheral portion (3Z) are distant portions. Area (F2), peripheral 4 zones (4
Z) shows an example of a multiple concentric bifocal lens in which the near portion area (N2) and the dimming element (ND) have a diameter of 2 mm (the dimming element diameter is the same as 1Z).

One zone (1Z) at the center has a zone width of 1 mm, and two zones (2Z) toward the periphery have a width of 0.1 mm.
75mm zone width, 3 zones (3Z) 0.5
0 mm zone width, 4 zone (4Z) 0.50
mm zone width.

[0139]

[Table 11] As shown in Table 11, when ND = 0% (there is no dimming element), the far-vision area (F1) of the central 1 zone and the 3 zones
The extinction rate (F1) of the focal point composed of F0 is 0%, and the peripheral two zones by the luminous flux in the far vision area (F1) of the central one zone are 4%.
The interference (N12) at the focal point, consisting of the near zone (N1 and N2) of the zone, is 0.14%. On the other hand, as the density of the dimming element is increased, the extinction rate (F1) of the focus formed by the far-vision portion area (F1) in the central one zone increases at the far-vision focus. The dimming rate (F2) of the focal point, which is composed of the far vision area (F2) of the three peripheral zones, is 0%.
Therefore, the extinction rate (F12) of the focal point, which is composed of the far-vision area (F1 and F2) of the central zone 1 and the peripheral zone 3, gradually increases. In the near portion focus, an interference rate (N12) of the light flux of the far portion region (F1) of the central one zone to the focus formed by the peripheral portion 2 zones and the 4 zone near portion portions (N1 and N2). Decreases.

Here, since the filter density of a general contact lens is 15%, if this value is set as a limit value, in this example, the filter density of the light reduction element is 40%. At this time, the extinction rate (F1) of the focal point, which is composed of the far-vision area (F1 and F2) of the central zone 1 and the peripheral zone 3
2) is 13.3%, the far vision area (F
The interference (N12) of the light flux of (1) to the focal point composed of the near zone (N1 and N2) of 2 zones and 4 zones at the periphery is 0.09%. Therefore, at the focal point composed of the near zone (N1 and N2) of 2 zones and 4 zones at the peripheral portion, the light is not attenuated by the dimming element, but is generated by the luminous flux of the far zone (F1) of the center 1 zone. Interference rate (N12) is 3
6% reduction.

If the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the light reduction element is 100% in this example. At this time, the central part 1 zone and the peripheral part 3
The dimming rate (F12) of the focal point composed of the far-field portions (F1 and F2) of the zone is 33.3%, and the peripheral two zones and the four zones due to the luminous flux of the far-field portion (F1) in the central one zone. The interference rate (N1) to the focus consisting of the near zone (N1 and N2)
2) is 0%. Therefore, at the focal point composed of the near zone (N1 and N2) of 2 zones and 4 zones at the peripheral portion, the light is not attenuated by the dimming element, but is generated by the luminous flux of the far zone (F1) of the center 1 zone. Interference rate (N12) is 1
00% avoided.

(12) Example 12 One zone (1Z) in the central part is a distance portion area (F1), two zones (2Z) in a peripheral portion are near portions (N1), and three zones in a peripheral portion (3Z) are distant portions. Area (F2), peripheral 4 zones (4
Z) shows an example of a multiple concentric bifocal lens in which the near zone (N2) and the dimming element (ND) have a diameter of 3 mm (the dimming element diameter is larger than 1Z).

One zone (1Z) at the center has a zone width of 1 mm, and two zones (2Z) toward the periphery have a width of 0.1 mm.
75mm zone width, 3 zones (3Z) 0.5
0 mm zone width, 4 zone (4Z) 0.50
mm zone width.

[0144]

[Table 12] As shown in Table 12, when ND = 0% (there is no dimming element), the far-vision area (F1) of the central 1 zone and the 3 zones
The extinction ratio (F12) of the focus consisting of 0% is applied to the focus consisting of two peripheral zones and four near zones (N1 and N2) due to the luminous flux in the far zone (F1) of the central zone. Is 0.14%. On the other hand, as the density of the dimming element is increased, the extinction rate (F) of the focal point formed by the distant part area (F1) in the central one zone is increased in the distance part focus.
1) is increased, but the distance portion area (F
The extinction ratio (F2) of the focus composed of 2) is 0%. Therefore, the extinction rate (F12) of the focal point, which is composed of the far-vision area (F1 and F2) of the central zone 1 and the peripheral zone 3, gradually increases. On the other hand, in the near portion focus, the dimming rate (N1) of the focus formed by the near portion region (F1) of the peripheral two zones increases, but the focus formed by the near portion region (N2) of the four peripheral zones. Is 0%. Therefore, the central part 1
The interference rate of the luminous flux in the far vision region (F1) of the zone to the focal point composed of the near vision regions (N1 and N2) of the two peripheral zones and four zones is reduced.

Since the filter density of a general contact lens is 15%, taking this value as a limit value, in the case of this example, the filter density of the dimming element is 40%. At this time, the extinction ratio (F12) of the focal point of the distance portion is 13.3%. On the other hand, in the near focus, the dimming rate (N1) of the focus consisting of the near zone (N1) of the two peripheral zones is 24.2.
%, And the imaging loss rate of the focal point composed of the near zone (N1 and N2) of the peripheral 2 zones and 4 zones is 11%. In addition, the interference rate of the light flux of the far portion area (F1) of the central one zone to the focal point formed by the peripheral two zones and the four near zones (N1 and N2) is 0.09%. Therefore, the near zone area (N
With the focal point composed of 1 and N2), the interference rate due to the luminous flux in the far vision area (F1) in the central one zone could be reduced by 36%.

If the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the light reduction element is 100% in the present example. At this time, the extinction ratio of the far focus (F1
2) is 33.3%. On the other hand, in the near focus, the dimming rate (N1) of the focus consisting of the near zone (N1) in the peripheral two zones is 60.6%, and the far zone (F1) in the central one zone. Is 0% with respect to the focal point composed of the near zone (N1 and N2) of the peripheral two zones and the four zones. Therefore, at the focal point composed of the near zone (F1 and F2) of the peripheral zone 2 and the zone 4, the imaging loss rate is 27.4%, but the luminous flux of the far zone (F1) of the central zone 1 is generated. Was able to avoid 100% of the interference rate.

(13) Example 13 One zone (1Z) in the center portion is the near portion region (N), and the middle portion 2
The zone (2Z) comprises the progressive zone (P), the peripheral three zones (3Z) comprise the distance zone (F), and the dimming element (ND) has a diameter of 1 mm (the dimming element diameter is smaller than 1Z). An example of a concentric multifocal lens is shown.

The examples shown in Tables 13 to 18 are all examples of concentric multifocal lenses. The zone width of the central one zone (1Z) is 1 mm, and the intermediate zone is two zones (2Z).
Is 1 mm, and the zone width of the three peripheral zones (3Z) is 0.75 mm.

[0149]

[Table 13] As shown in Table 13, when ND = 0% (there is no dimming element), the extinction ratio (NG) of the focal point composed of the near portion area in the central one zone is 0%, and the focal point near the central one zone is NG. The interference rate (PK) of the light flux in the peripheral area to the focal point composed of the progressive area in the two peripheral zones is 0.95%, and the interference range of the light reducing element is 0.
mm. Further, the interference rate (FK) with respect to the focal point composed of the far vision area in the three peripheral zones is 0.21%, and the interference range of the dimming element is 0 mm. On the other hand, as the density of the dimming element is increased, the dimming rate (NG) of the focal point composed of the near portion area in the central one zone increases at the near portion focal point, but increases at the intermediate portion. The dimming rate of the focal point including the progressive zone of two zones and the near zone of three peripheral zones is 0%. Accordingly, the extinction ratio (NG) of the focal point composed of the near zone in the central zone increases, but conversely, the progressive zone in the middle zone and the peripheral zone due to the luminous flux in the near zone in the central zone. The interference rate (PK and FK) at the focal point formed by the far vision region of the third zone is reduced.

Here, since the filter density of a general contact lens is 15%, taking this value as a limit value, in the case of this example, the filter density of the dimming element is 60%. At this time, the extinction ratio (NG) of the focal point composed of the near zone of the central zone 1 is 15%, and the luminous flux of the near zone of the central zone 1 is changed to the focal zone composed of the progressive zone of the intermediate zone 2. Has an interference rate (PK) of 0.38%, and the interference range of the light reducing element is 0.0089 mm. The interference rate (FK) of the luminous flux in the near zone in the central zone with respect to the focal point formed in the far zone in the three peripheral zones is 0.08%.
The interference range of the light reducing element is 0.0173 mm. Therefore, at the focal point composed of the progressive zone in the middle two zones, the interference rate (PK) due to the luminous flux in the near zone in the central one zone could be reduced by 60% without being dimmed by the darkening element. Also, at the focal point formed by the far vision region of the three peripheral zones, the central portion 1 is not dimmed by the dimming element.
The interference factor (FK) due to the luminous flux in the near portion area of the zone is 62
% Reduction.

If the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the light reduction element is 100% in this example. At this time, the extinction ratio (NG) of the focal point composed of the near zone of the central zone 1 is 25%, and the light flux of the near zone of the central zone 1 is changed to the focal zone composed of the progressive zone of the intermediate zone 2 by the light flux of the near zone. Has an interference rate (PK) of 0%, and the interference range of the dimming element is 0.0089 mm. Further, the interference rate (FK) of the luminous flux in the near portion area in the central one zone to the focal point formed in the far portion area in the three peripheral zones is 0%, and the interference range of the light reducing element is 0.0173 mm. Therefore, at the focal point composed of the progressive zone in the middle two zones, the interference factor (PK) due to the luminous flux in the near zone in the central one zone could be avoided 100% without being dimmed by the dimming element. Further, at the focal point composed of the far vision area in the three peripheral zones, the interference factor (FK) due to the luminous flux in the near vision area in the central one zone is 1 without being dimmed by the dimming element.
00% avoided.

(14) Example 14 One zone (1Z) in the central portion is the near portion region (N) and the intermediate portion 2
The zone (2Z) is composed of the progressive zone (P), the peripheral three zones (3Z) are the far zone (F), and the dimming element (ND) has a diameter of 2 mm (the dimming element diameter is the same as 1Z). 3 shows a concentric multifocal lens.

The zone width of the central one zone (1Z) is 1 m.
m, the zone width of the intermediate zone 2 zone (2Z) is 1 mm, and the zone width of the peripheral zone 3 zone (3Z) is 0.75 mm.

[0154]

[Table 14] As shown in Table 14, when ND = 0% (there is no dimming element), the extinction ratio (NG) of the focal point composed of the near portion area in the central one zone is 0%, and the focal point near the central one zone is NG. The interference rate (PK) of the light flux in the peripheral area to the focal point composed of the progressive area in the two peripheral zones is 0.95%, and the interference range of the light reducing element is 0.
mm. Further, the interference rate (FK) with respect to the focal point composed of the far vision area in the three peripheral zones is 0.21%, and the interference range of the dimming element is 0 mm. On the other hand, as the density of the dimming element is increased, the dimming rate (NG) of the focal point composed of the near portion area in the central one zone increases at the near portion focal point, but increases at the intermediate portion. The dimming rate of the focal point including the progressive zone of two zones and the far zone of three peripheral zones is 0%. Accordingly, the extinction ratio (NG) of the focal point composed of the near zone in the central zone increases, but conversely, the progressive zone in the middle zone and the peripheral zone due to the luminous flux in the near zone in the central zone. The interference rate (PK and FK) at the focal point formed by the far vision region of the third zone is reduced.

Here, since the filter density of a general contact lens is 15%, if this value is set as a limit value, in the case of this example, the filter density of the light reduction element is 10%. At this time, the extinction ratio (NG) of the focal point composed of the near zone of the central zone 1 is 10%, and the luminous flux of the near zone of the central zone 1 is changed to the focal zone composed of the progressive zone of the intermediate zone 2. Has an interference rate (PK) of 0.85% and an interference range of the light reducing element is 0.0178 mm. The interference rate (FK) of the luminous flux in the near zone in the central zone to the focal point formed in the far zone in the three peripheral zones is 0.19%.
The interference range of the light reducing element is 0.0345 mm. Therefore, at the focal point composed of the progressive zone in the middle two zones, the interference rate (PK) due to the luminous flux in the near zone in the central one zone could be reduced by 11% without being dimmed by the darkening element. Also, at the focal point formed by the far vision region of the three peripheral zones, the central portion 1 is not dimmed by the dimming element.
The interference factor (FK) due to the luminous flux in the near portion area of the zone is also 10
% Reduction.

In addition, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the dimming element is 50% in this example. At this time, the extinction ratio (NG) of the focal point composed of the near zone of the central zone 1 is 50%, and the luminous flux of the near zone of the central zone 1 is changed to the focal zone composed of the progressive zone of the intermediate zone 2. Has an interference rate (PK) of 0.47%, and the interference range of the light reducing element is 0.0178 mm. Further, the interference rate (FK) of the luminous flux in the near zone in the central zone with respect to the focal point formed in the far zone in the three peripheral zones is 0.1.
At 1%, the interference range of the dimming element is 0.0345 mm.
Therefore, at the focal point composed of the progressive portion area of the middle 2 zone, the central portion 1 is not dimmed by the dimming element.
The interference rate (PK) due to the luminous flux in the near portion area of the zone is 51
% Reduction. Also, at the focal point composed of the far vision area of the peripheral four zones, the light is not dimmed by the dimming element,
The interference rate (F
K) was also reduced by 48%.

(15) Example 15 One zone (1Z) in the central portion is the near portion region (N), and the intermediate portion 2
The zone (2Z) comprises the progressive zone (P), the peripheral three zones (3Z) comprise the distance zone (F), and the dimming element (ND) has a diameter of 3 mm (the dimming element diameter is larger than 1Z). An example of a concentric multifocal lens is shown.

The zone width of the central one zone (1Z) is 1 m.
m, the zone width of the intermediate zone 2 zone (2Z) is 1 mm, and the zone width of the peripheral zone 3 zone (3Z) is 0.75 mm.

[0159]

[Table 15] As shown in Table 15, when ND = 0% (there is no dimming element), the extinction ratio (NG) of the focal point composed of the near portion area in the central one zone is 0%, and the focal point near the central one zone is NG. The interference rate (PK) with respect to the focal point formed by the progressive portion region of the two peripheral zones due to the light flux in the application portion region is 0.95%. Further, the interference rate (FK) with respect to the focal point composed of the far vision area in the three peripheral zones is 0.
21%. On the other hand, as the dimming density of the dimming element is increased, the dimming rate (NG) of the focal point composed of the near region in the central one zone increases at the near focal point. In the progressive portion focal point, the dimming rate of the focal point composed of the intermediate portion 2 zone is increased, but the luminous flux of the near portion region of the central portion 1 zone causes the light flux to the focal point composed of the intermediate portion 2 zone progressive portion. The interference rate (PK) decreases. In the distance portion focus, the peripheral portion 3
The extinction rate of the focal point composed of the far vision region of the zone is 0%, and only the interference rate (FK) of the luminous flux of the near vision region of the central one zone to the focal point composed of the far vision region of the three peripheral zones. Decrease.

Here, since the filter density of a general contact lens is 15%, if this value is set as a limit value, in the case of this example, the filter density of the light reduction element is 10%. At this time, the extinction ratio (NG) of the focal point composed of the near zone of the central zone 1 is 10%, and the luminous flux of the near zone of the central zone 1 is changed to the focal zone composed of the progressive zone of the intermediate zone 2. Has an interference rate (PK) of 0.85%. Also,
The interference rate (FK) of the luminous flux in the near zone in the central zone with respect to the focal point formed in the far zone in the three peripheral zones is 0.
19%. Therefore, at the focal point composed of the progressive zone of the middle two zones, the interference rate (CK) due to the luminous flux in the near zone of the central one zone could be reduced by 11%. Further, at the focal point composed of the far vision area in the three peripheral zones, the interference rate (FK) due to the light flux in the near vision area in the central one zone could be reduced by 10% without being dimmed by the dimming element. .

Further, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the dimming element is 50% in this example. At this time, the extinction ratio (NG) of the focal point composed of the near zone of the central zone 1 is 50%, and the luminous flux of the near zone of the central zone 1 is changed to the focal zone composed of the progressive zone of the intermediate zone 2. Has an interference rate (PK) of 0.47%. Further, the interference rate (F) of the light flux in the near portion area of the central one zone to the focal point formed by the far portion area in the three peripheral zones.
K) is 0.11%. Therefore, at the focal point composed of the progressive zone in the middle two zones, the interference rate (PK) due to the luminous flux in the near zone in the central one zone could be reduced by 51%. Further, at the focal point composed of the far vision region in the three peripheral zones, the interference rate (FK) due to the luminous flux in the near vision region in the central one zone is 48% without being dimmed by the dimming element.
Could be reduced.

(16) Example 16 One zone (1Z) in the central part is the distance part area (F) and the intermediate part 2
The zone (2Z) includes the progressive zone (P), the peripheral three zones (3Z) include the near zone (N), and the dimming element (ND) has a diameter of 1 mm (the dimming element diameter is smaller than 1Z). An example of a concentric multifocal lens is shown.

The zone width of the central one zone (1Z) is 1 m.
m, the zone width of the intermediate zone 2 zone (2Z) is 1 mm, and the zone width of the peripheral zone 3 zone (3Z) is 0.75 mm.

[0164]

[Table 16] As shown in Table 16, when ND = 0% (there is no dimming element), the extinction rate (FK) of the focal point composed of the far-vision part area in the central one zone is 0%, and the extinction rate in the central one zone is zero. The interference rate (PK) of the luminous flux in the peripheral area to the focal point formed by the progressive area in the two peripheral zones is 0.89%, and the interference range of the light reducing element is 0.
mm. The interference rate (NK) with respect to the focal point formed by the near zone of the three peripheral zones is 0.18%, and the interference range of the dimming element is 0 mm. On the other hand, as the density of the dimming element is increased, the extinction ratio (FG) of the focal point composed of the distant portion area in the central one zone increases at the far portion focal point, but increases in the middle portion. The dimming rate of the focal point including the progressive zone of two zones and the far zone of three peripheral zones is 0%. Therefore, the extinction ratio (FG) of the focal point formed by the far-field portion in the central one zone increases, but conversely, the intermediate-portion two-zone progressive region and the peripheral portion by the luminous flux of the far-field portion in the central one zone. Rate of interference (PK)
And NK) decrease.

Here, since the filter density of a general contact lens is 15%, if this value is set as a limit value, in this example, the filter density of the light reduction element is 60%. At this time, the extinction ratio (NG) of the focal point composed of the far portion area of the central one zone is 15%, and the light flux of the far portion area of the central one zone is shifted to the focal point composed of the progressive portion area of the intermediate two zones by the luminous flux of the far portion area of the central portion. Has an interference rate (PK) of 0.36%, and the interference range of the dimming element is 0.0092 mm. In addition, the interference rate (NK) of the light flux in the far portion area in the central one zone to the focal point formed in the near portion area in the three peripheral zones is 0.07%.
The interference range of the light reducing element is 0.0186 mm. Therefore, at the focal point composed of the progressive zone in the middle two zones, the interference rate (PK) due to the luminous flux in the far zone in the central one zone could be reduced by 60% without being dimmed by the dimming element. Further, at the focal point composed of the near portion area of the three peripheral zones, the central portion 1 is not dimmed by the dimming element.
The interference rate (NK) due to the luminous flux in the far vision area of the zone is 61
% Reduction.

In addition, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the light reduction element is 100% in this example. At this time, the extinction ratio (FG) of the focal point composed of the far vision region of the central one zone is 25%, and the light flux of the far vision region of the central one zone is shifted to the focal point composed of the progressive region of the intermediate two zones. Has an interference rate (PK) of 0%, and the interference range of the dimming element is 0.0092 mm. Further, the interference rate (NK) of the light flux in the far portion area of the central one zone to the focal point formed by the near portion areas of the three peripheral zones is 0%, and the interference range of the light reducing element is 0.0186 mm. Therefore, at the focal point composed of the progressive zone in the middle two zones, the interference factor (PK) due to the luminous flux in the far zone in the central one zone could be avoided 100% without being dimmed by the dimming element. Further, at the focal point composed of the near zone of the three peripheral zones, the interference factor (NK) due to the luminous flux in the far zone of the central one zone is also 1 without being dimmed by the dimming element.
00% avoided.

(17) Example 17 One zone (1Z) in the central part is the distance part area (F) and the intermediate part 2
The zone (2Z) includes the progressive zone (P), the peripheral three zones (3Z) include the near zone (N), and the dimming element (ND) has a diameter of 2 mm (the dimming element diameter is the same as 1Z). An example of a concentric multifocal lens is shown.

The zone width of the central one zone (1Z) is 1 m.
m, the zone width of the intermediate zone 2 zone (2Z) is 1 mm, and the zone width of the peripheral zone 3 zone (3Z) is 0.75 mm.

[0169]

[Table 17] As shown in Table 17, when ND = 0% (there is no dimming element), the extinction rate (NG) of the focal point composed of the far vision area in the central one zone is 0%, and the extinction rate in the central one zone is NG. The interference rate (PK) of the luminous flux in the peripheral area to the focal point formed by the progressive area in the two peripheral zones is 0.89%, and the interference range of the light reducing element is 0.
mm. The interference ratio (NK) with respect to the focal point formed by the near zone of the three peripheral zones is 0.18%, and the interference range of the dimming element is 0 mm. On the other hand, as the density of the dimming element is increased, the extinction ratio (FG) of the focal point composed of the distant portion area in the central one zone increases at the far portion focal point, but increases in the middle portion. The dimming rate of the focal point including the progressive zone of two zones and the near zone of three peripheral zones is 0%. Therefore, the extinction ratio (FG) of the focal point formed by the far-field portion in the central one zone increases, but conversely, the intermediate-portion two-zone progressive region and the peripheral portion by the luminous flux of the far-field portion in the central one zone. The interference rate (PK and NK) on the focal point consisting of the near zone of the zone 3 is reduced.

Here, since the filter density of a general contact lens is 15%, if this value is set as a limit value, in this example, the filter density of the light reduction element is 10%. At this time, the extinction ratio (FG) of the focal point composed of the far portion area of the central one zone is 10%, and the light flux of the far portion area of the central one zone is shifted to the focal point composed of the progressive portion area of the intermediate two zones. Has an interference rate (PK) of 0.8% and an interference range of the light reducing element is 0.0184 mm. The interference (NK) of the luminous flux in the far vision region in the central one zone to the focal point consisting of the near vision region in the three peripheral zones is 0.16%, and the interference range of the dimming element is 0.0373 mm. is there. Therefore, at the focal point composed of the progressive zones in the middle two zones, the interference rate (PK) due to the luminous flux in the far zone in the central one zone could be reduced by 10% without being dimmed by the dimming element. Further, at the focal point composed of the near portion area of the three peripheral zones, the central portion 1 is not dimmed by the dimming element.
The interference rate (NK) due to the luminous flux in the far vision area of the zone is also 11
% Reduction.

Further, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, in this example, the density of the dimming element is 50%. At this time, the extinction ratio (FG) of the focal point composed of the far vision region of the central one zone is 50%, and the light flux of the far vision region of the central one zone is shifted to the focal point composed of the progressive zone of the intermediate two zones. Has an interference rate (CK) of 0.44% and an interference range of the light reducing element is 0.0184 mm. Also, the interference rate (NK) of the light flux in the far vision part area of the central one zone to the focal point consisting of the near vision area of the three peripheral zones is 0.0.
At 9%, the interference range of the dimming element is 0.0373 mm.
Therefore, at the focal point composed of the progressive portion area of the middle 2 zone, the central portion 1 is not dimmed by the dimming element.
The interference rate (PK) due to the luminous flux in the far vision area of the zone is 51
% Reduction. Further, at the focal point formed by the near portion area of the peripheral three zones, the light is not dimmed by the dimming element,
The interference rate (F
K) was also reduced by 50%.

(18) Example 18 One zone (1Z) in the central part is the distance part area (F) and the intermediate part 2
The zone (2Z) comprises the progressive zone (P), the three peripheral zones (3Z) comprise the near zone (N), and the dimming element (ND) has a diameter of 3 mm (the dimming element diameter is larger than 1Z). An example of a concentric multifocal lens is shown.

The zone width of the central one zone (1Z) is 1 m.
m, the zone width of the intermediate zone 2 zone (2Z) is 1 mm, and the zone width of the peripheral zone 3 zone (3Z) is 0.75 mm.

[0174]

[Table 18] As shown in Table 18, when ND = 0% (there is no dimming element), the extinction rate (FG) of the focal point composed of the distant portion area in the central one zone is 0%, and the distant point in the central one zone is distant. The interference rate (PK) with respect to the focal point formed by the progressive portion area of the two peripheral zones due to the light flux in the use section area is 0.89%. Further, the interference rate (NK) with respect to the focal point composed of the near portion area of the three peripheral zones is 0.1.
18%. On the other hand, as the dimming density of the dimming element is increased, the extinction ratio (FG) of the focal point composed of the distant portion region in the central one zone increases at the far portion focal point. At the progressive focal point, the dimming rate of the focal point composed of the progressive section area of the intermediate 2 zone increases, but the light flux of the far vision section area of the central 1 zone increases the focus to the focal point composed of the progressive section area of the intermediate 2 zone. The interference rate (PK) decreases. In near focus, peripheral 3
The extinction rate of the focal point composed of the near zone of the zone is 0%, and only the interference rate (NK) of the luminous flux of the far zone of the central zone with the focal zone composed of the near zone of the three peripheral zones by the luminous flux. Decrease.

Here, since the filter density of a general contact lens is 15%, if this value is set as a limit value, in this example, the filter density of the dimming element is 10%. At this time, the extinction ratio (FG) of the focal point composed of the far portion area of the central one zone is 10%, and the light flux of the far portion area of the central one zone is shifted to the focal point composed of the progressive portion area of the intermediate two zones. Has an interference rate (PK) of 0.8%. In addition, the interference rate (NK) of the light flux in the far portion area in the central one zone to the focus formed in the near portion area in the three peripheral zones is 0.1.
6%. Accordingly, at the focal point composed of the progressive zone in the middle two zones, the interference rate (PK) due to the light beam in the far zone in the central one zone could be reduced by 10%. Further, at the focal point composed of the near portion areas in the three peripheral zones, the interference rate (NK) due to the luminous flux in the far portion area in the central one zone could be reduced by 11% without being dimmed by the dimming element. .

In addition, if the sunglass effect is expected, the filter density of the contact lens is 50%. If this value is set as a limit value, the density of the dimming element is 50% in this example. At this time, the extinction ratio (NG) of the focal point composed of the far vision region of the central zone 1 is 50%, and the light flux of the far vision region of the central zone 1 is changed to the focal point composed of the progressive region 2 of the intermediate zone. Has an interference rate (PK) of 0.44%. In addition, the interference rate (N) of the light flux in the far portion area of the central one zone to the focus formed by the near portion area of the three peripheral zones.
K) is 0.09%. Therefore, at the focal point composed of the progressive zone in the middle two zones, the interference rate (PK) due to the light flux in the far zone in the central one zone could be reduced by 51%. Further, at the focal point composed of the near portion area of the three peripheral zones, the interference rate (NK) due to the light flux in the far portion area of the central one zone is reduced by 50% without being dimmed by the dimming element.
Could be reduced.

[0177]

As described above, according to the structure of the present invention, a lens in which a near portion curved surface for viewing and a far portion curved surface for viewing far away is formed concentrically with the optical axis. In a contact lens having a curve, dimming is performed to reduce the amount of light transmitted through the central curved surface region to a central curved surface region defined on the lens curve with a predetermined radius as a radius around the intersection of the lens curve and the optical axis. Since the means is formed, it is possible to avoid that the image by the second curved surface at the second focal plane is subjected to "interference" by the light beam emitted from the first curved surface,
A clear image can be formed, the image can be clearly separated between the image by the near portion and the image by the far portion, and a clear visual acuity can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a contact lens to which a first embodiment of the present invention is applied.

FIG. 2A is a cross-sectional view illustrating a contact lens according to a first embodiment of the present invention, and “interference” between a first imaging plane (first focal plane) and a second imaging plane (second focal plane). (B) for explaining the presence / absence of.

FIG. 3 is a sectional view showing a modified example of the contact lens according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a modification of the contact lens according to the first embodiment of the present invention.

FIG. 5A is a sectional view showing a contact lens according to a second embodiment of the present invention, and “interference” between a first image plane (first focal plane) and a second image plane (second focal plane). (B) for explaining the presence / absence of.

FIG. 6 is a sectional view showing a modification of the contact lens according to the second embodiment of the present invention.

FIG. 7 is a sectional view showing a modification of the contact lens according to the second embodiment of the present invention.

FIG. 8 is a sectional view showing a contact lens to which a third embodiment of the present invention is applied.

FIG. 9 is a sectional view showing a contact lens according to a third embodiment of the present invention.

FIG. 10 is a sectional view showing a modification of the contact lens according to the third embodiment of the present invention.

FIG. 11 is a sectional view showing a modification of the contact lens according to the third embodiment of the present invention.

FIG. 12 is a sectional view showing a contact lens according to a fourth embodiment of the present invention.

FIG. 13 is a sectional view showing a modification of the contact lens according to the fourth embodiment of the present invention.

FIG. 14 is a sectional view showing a modification of the contact lens according to the fourth embodiment of the present invention.

FIG. 15 is a sectional view showing a contact lens to which a fifth embodiment of the present invention is applied.

FIG. 16A is a sectional view showing a contact lens according to a fifth embodiment of the present invention, and “interference” between a first image plane (first focal plane) and a second image plane (second focal plane). (B) for explaining the presence / absence of.

FIG. 17 is a sectional view showing a modification of the contact lens according to the fifth embodiment of the present invention.

FIG. 18 is a sectional view showing a modification of the contact lens according to the fifth embodiment of the present invention.

FIG. 19 is a sectional view showing a contact lens according to a sixth embodiment of the present invention.

FIG. 20 is a sectional view showing a modification of the contact lens according to the sixth embodiment of the present invention.

FIG. 21 is a sectional view showing a modification of the contact lens according to the sixth embodiment of the present invention.

FIG. 22 illustrates a finished product of a bar material for processing a contact lens according to the present invention.

FIG. 23 is a view for explaining a method of manufacturing a bar member comprising a light transmitting portion of a contact lens according to the present invention.

FIG. 24 is a view for explaining through-hole treatment of a bar material comprising a light-opaque portion of a contact lens according to the present invention.

FIG. 25 is a sectional view showing a concentric bifocal contact lens according to the related art.

FIG. 26 is a sectional view showing a concentric bifocal contact lens with a prism according to the related art.

FIG. 27 is a cross-sectional view showing a multiple concentric bifocal contact lens in which a distance portion and a near portion are alternately arranged according to the related art.

FIG. 28 is a sectional view showing a concentric progressive multifocal contact lens in which the power from a distance portion to a near portion progressively changes according to the related art.

FIG. 29 is a cross-sectional view for explaining the contact lens of the present invention, and shows the presence / absence of “interference” on the first imaging plane (first focal plane) and the second imaging plane (second focal plane). FIG.

FIG. 30 is a cross-sectional view for explaining a modified example of the contact lens of the present invention, and “interference” between a first imaging plane (first focal plane) and a second imaging plane (second focal plane). (B) for explaining the presence / absence of.

FIG. 31 is a sectional view (a) of a contact lens for explaining that the present invention can be applied to a case where an object having a finite size is at a finite distance position, together with FIG. 32 and FIG. FIG. 9B illustrates the presence or absence of “interference” between the (first focal plane) and the second imaging plane (second focal plane).

FIG. 32 is a sectional view (a) of a contact lens for explaining that the present invention can be applied to a case where an object having a finite size is located at a finite distance position together with FIGS. FIG. 9B illustrates the presence or absence of “interference” between the (first focal plane) and the second imaging plane (second focal plane).

FIG. 33 is a sectional view (a) of a contact lens for explaining that the present invention is applicable even when an object having a finite size is located at a finite distance position, together with FIG. 31 and FIG. FIG. 9B illustrates the presence or absence of “interference” between the (first focal plane) and the second imaging plane (second focal plane).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact lens 2 Front curve 3 Base curve 5 First curved surface 6 Second curved surface 8 Dimming means 10 Optical axis 11 First imaging plane (first focal plane) 12 First focal plane 13 Second imaging plane (Second focal plane) Surface) 14 second focal point 25 annular ring with background light on first focal plane 25a annular ring with background light on first focal plane 26 disk with background light on second focal plane 26a with background light on second focal plane Disk

Claims (16)

[Claims] 1. A contact lens having a lens curve in which a near portion curved surface for viewing near and a far portion curved surface for viewing far away are formed concentrically with respect to an optical axis. A curved surface composed of one near portion curved surface or one far portion curved surface including the first curved surface is defined as a first curved surface, and a curved surface composed of one far portion curved surface or one near portion curved surface adjacent to the outside of the first curved surface is referred to as a first curved surface. A two-curved surface; a central curved surface region defined on the lens curve having a predetermined radius as a center around the intersection of the lens curve and the optical axis; a dimming for reducing the amount of transmitted light passing through the central curved surface region A contact lens characterized in that a means is formed. 2. The first curved surface is a near portion curved surface, the second curved surface is a far portion curved surface, and the first image forming surface which is an image forming surface of the first curved surface is the second curved surface. Is located closer to the lens curve than the second imaging surface, which is the imaging surface according to the above, passes through the first curved surface, condenses on the first imaging surface, and reaches the second imaging surface The contact lens according to claim 1, wherein the dimming means is formed in the central curved surface region so as to reduce a light amount of a light beam. 3. The first curved surface is a distance portion curved surface, the second curved surface is a near portion curved surface, and the first image forming surface, which is an image forming surface of the first curved surface, is the second curved surface. The central curved surface is located at a position farther from the lens curve than the second image forming surface, which is an image forming surface according to the present invention, so as to reduce the amount of light transmitted through the first curved surface and reaching the second image forming surface. 2. The contact lens according to claim 1, wherein the dimming means is formed in a region. 4. The image forming apparatus according to claim 1, wherein the first image plane is near a first focal plane which is a focal plane relating to the first curved surface, and the second image plane is a focal plane which is a focal plane relating to the second curved surface. The contact lens according to claim 2, wherein the contact lens is located near a bifocal plane. 5. The apparatus according to claim 1, wherein a first focal point, which is a focal point relating to the first curved surface, and a second focal point, which is a focal point relating to the second curved surface, are on the optical axis. contact lens. 6. The contact lens according to claim 1, wherein the central curved surface area is defined as a range of the first curved surface. 7. The contact lens according to claim 1, wherein the central curved surface region is a part of the first curved surface. 8. The contact lens according to claim 7, wherein said dimming means is a shielding means for shielding transmission of light. 9. The method according to claim 1, wherein a curved portion for near portion and a curved portion for far portion are alternately and repeatedly formed concentrically with respect to the optical axis outside the second curved surface. contact lens. 10. The apparatus according to claim 9, wherein the central curved surface area is the first curved surface and a range beyond the first curved surface.
A contact lens according to item 1. 11. The contact lens according to claim 1, wherein said dimming means is formed in a thin film on said lens curve. 12. The contact lens according to claim 1, wherein the dimming means is formed when the contact lens body is superimposed. 13. The contact lens according to claim 1, wherein said dimming means is formed by dyeing after superimposing the contact lens body. 14. The light reduction means according to claim 12, wherein the light reduction ratio is set according to the staining density.
Or the contact lens according to claim 13. 15. The contact lens according to claim 1, wherein the size of the predetermined radius is set according to the size of a pupil. 16. The apparatus according to claim 1, wherein said lens curve is a front curve opposed to a base curve.
A contact lens according to item 1.