JPH105176A - Visual acuity table presentation device and target plate for stereoscopic vision - Google Patents

Abstract

(57) [Summary] The present invention provides a visual acuity chart presenting apparatus capable of performing a stereoscopic vision test of an eye to be inspected without using polarized glasses or the like. SOLUTION: The visual acuity table presentation device of the present invention includes an optotype plate 4 provided with a stereoscopic visual target composed of a plurality of stereoscopic marks having different parallaxes from the eye E, and a stereoscopic vision of the visual target plate 4. The apparatus includes a half mirror 7 for forming an optotype image of the target for visual observation at a position where the eye to be inspected can be visually recognized, and a target optical system 6 including a concave mirror 8.
By forming a stereoscopic visual target of the visual target plate 4 at a position where the eye to be inspected can be visually recognized by the visual target optical system 6, a stereoscopic test of the eye to be inspected can be performed without using polarizing glasses or the like. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual acuity chart presenting apparatus and a stereoscopic optotype plate, and more particularly, to a visual acuity chart presenting apparatus and a visual acuity chart presenting apparatus which enable stereoscopic viewing of a visual target without using polarized glasses or the like. The present invention relates to a target plate for stereoscopic vision.

[0002]

2. Description of the Related Art In many cases of performing a stereoscopic vision test on a subject's eye using a conventional visual acuity table presentation device, the subject is polarized.
As the optotype, a polarizing optotype made by attaching a polarizing filter to the light transmitting portion of the flat optotype plate is used, and the subject wears polarizing glasses to separate the two types of optotypes into left and right eyes individually. Needed to be presented.

[0003]

However, in the conventional visual acuity chart presentation apparatus described above, since the polarized visual target is formed by attaching a polarizing filter to the visual target plate, the stereoscopic vision test of the eye to be examined is constant. Only the parallax inspection was performed.

[0004] In addition, the subject must wear polarized glasses for his own eyes, which is extremely complicated.

The present invention has been made in view of the above circumstances, and it is possible to perform a stereoscopic test of an eye to be inspected without using a polarizing filter, and also to wear polarized glasses on one's own eye. It is an object of the present invention to provide a visual acuity table presentation device that is extremely practical without the necessity of performing.

Another object of the present invention is to provide an optotype plate for stereoscopic vision, which enables a stereoscopic vision test of an eye to be examined to be performed extremely easily without using polarized glasses or the like.

[0007]

According to a first aspect of the present invention, there is provided a visual acuity chart presenting apparatus for stereoscopic vision in which a plurality of transparent plates are provided with a plurality of marks at different positions and superimposed. A target plate provided with a target, and a target optical system that forms a target image of a target for stereoscopic vision of the target plate at a position where the subject's eye can view the target. .

A visual acuity chart presentation apparatus according to the second aspect of the present invention is characterized in that the apparatus comprises a plurality of stereoscopic marks having different parallaxes depending on the subject's eye.

According to the visual acuity table presentation apparatus of the first aspect of the present invention, the image of the stereoscopic visual target composed of a plurality of stereoscopic marks having different parallaxes from the subject's eye is formed by the visual target optical system. Since an image is formed at a visible position, the subject's eye can visually recognize the images of the plurality of stereoscopic marks of the stereoscopic visual target with different parallaxes, that is, in a state having a sense of depth. The stereoscopic vision test of the eye to be inspected can be performed very simply without using such a method.

[0010] The stereoscopic visual target plate according to the second aspect of the present invention is composed of a plurality of stereoscopic visual marks having different parallaxes due to the subject's eye, so that the examiner holds the stereoscopic visual target plate in his hand. By causing the subject's eye to visually recognize the subject's eye, the images of the plurality of stereoscopic marks of the stereoscopic visual target can be visually recognized with different parallaxes, that is, in a state having a sense of depth. The stereoscopic vision test of the subject's eye can be performed very simply without using it.

[0011]

Embodiments of the present invention will be described below in detail.

(Embodiment 1) FIGS. 1 to 3 show a visual acuity chart presenting apparatus according to a first embodiment of the present invention. FIG. 1 is a perspective view of the visual acuity chart presenting apparatus according to the first embodiment. FIG. 2 is a front view of the visual acuity chart presenting apparatus of the first embodiment, and FIG. 3 is a cross-sectional view of the visual acuity chart presenting apparatus of the first embodiment.

The visual acuity chart presentation device according to the first embodiment shown in FIGS. 1 to 3 has a rectangular parallelepiped shape, a device body 1 having a rectangular opening 2 on one end face, and a device body 1 having the same shape. And an optotype plate 4 provided with a stereoscopic visual target 5 disposed inside the eye, and an image of the stereoscopic visual target 5 at a position where the eye to be inspected can visually recognize the eye, that is, the eye to be inspected looks through the opening 2. And a target optical system 6 that forms an image at a position that can be visually recognized.

As shown in FIGS. 1 and 3, the optotype optical system 6 is inclined at an angle of 45 degrees with respect to the optical axis of the optotype plate 4 for transmitting the light beam from the optotype 5 for stereoscopic vision. A half mirror 7 disposed therein; and a concave mirror 8 for reflecting a light beam transmitted through the half mirror 7 as a parallel light beam. Thus, the image of the target 5 for stereoscopic vision on the target plate 4 is formed as a virtual image at a distance of 5 m from the eye E to be inspected, for example.

Next, the optotype plate 4 and the optotype 5 for stereoscopic vision will be described in detail with reference to FIGS.

The target plate 4 includes first to third transparent plates (glass plates) 11, 12, and 13 formed in the same disk shape and having a thickness of about 1 mm to several mm. Are bonded as shown in FIG.

As shown in FIG. 4, the first transparent plate 11 is provided with a first stereoscopic mark 11a formed of an annular mark at the upper left in FIG.

As shown in FIG. 6, the second transparent plate 12 has a straight portion 14 provided at the center in FIG.
Two annular marks on the upper right of the
2nd mark consisting of two X marks attached to the lower left of
Is provided.

As shown in FIG. 7, the third transparent plate 13 is provided with a third stereoscopic mark 13a formed of an annular mark at the lower right in FIG.

The first to third transparent plates 11, 1
2 and 13 are attached as shown in FIG.
By superimposing the stereoscopic marks 11a to 13a, as shown in FIG. 8, there is provided a stereoscopic visual target 5 in which three annular marks and cross marks are respectively displayed above and below the linear portion 14. The target plate 4 is formed.

The target 5 for stereoscopic vision of the target plate 4 is a first
The parallax of the first stereoscopic mark 11a, the second stereoscopic mark 12a, and the third stereoscopic mark 13a by the eye to be examined is different depending on the thickness of the second transparent plates 11, 12, that is, the eye to be inspected. E is made to recognize with a sense of depth.

In this case, the first and second transparent plates 11,
The first stereoscopic mark 11a, the second stereoscopic mark 12a, and the third stereoscopic mark 12a can be changed by changing the thickness of the first and second transparent plates 11 to 13 in various ways.
Can be variously changed by the subject's eye E with the stereoscopic mark 13a.

According to the visual acuity table presenting apparatus having the above-described configuration,
When the subject's eye E looks through the opening 2, the image of the stereoscopic visual target 5 composed of the first to third stereoscopic marks 11a to 13a having different parallaxes can be visually recognized, thereby using polarized glasses or the like. The stereoscopic vision test of the subject's eye E can be performed extremely simply without performing, and the simplification of the stereoscopic vision test and the avoidance of the complexity of the subject can be realized.

When the above-described stereoscopic visual target 5 of the visual target plate 4 is projected onto a screen, the first stereoscopic visual mark 11a and the second stereoscopic visual target are used because the screen is flat. Any two of the mark 12a and the third stereoscopic mark 13a are blurred, but in the case of the present embodiment, the first stereoscopic mark 11a, the second stereoscopic mark 12a, Since the image of the 3D mark 13a is formed as a virtual image, these images are not blurred unlike the case of the screen projection type.

(Embodiment 2) Next, FIGS.
Embodiment 2 of the present invention will be described with reference to FIG.

FIG. 10 is a cross-sectional view of a visual acuity table presenting device according to the second embodiment. FIG. 11 is a plan view of a rotary plate 21 including the target plate 4 used in the visual acuity table presenting device of the second embodiment. Is the rotating plate 2 used in the visual acuity table presentation device of the second embodiment.
FIG. 2 is a side view showing the target plate 4 in FIG.

In the visual acuity chart presenting apparatus of the second embodiment, various optometrists including the stereoscopic optotypes 5 of the optotype board 4 are arranged in a circle in the apparatus main body 20, and light is emitted from each of the optotypes. Rotating plate 21 which is disposed so as to be able to transmit light and is driven to rotate by drive motor 30
An illumination system 22 for irradiating each of the optotypes with illumination light on the rotary plate 21; and a position where the optotype images of the optotypes including the stereoscopic visual target 5 of the rotary plate 21 can be viewed by the eye E. And a target optical system 23 that forms an image.

The illumination system 22 includes a light source lamp 25, a reflection mirror 26, a condenser lens system 27, and a filter 28. The light from the light source lamp 25 is reflected by the reflection mirror 26, and the condenser lens Each target including the target 5 for stereoscopic vision of the rotating plate 21 is illuminated via the system 27 and the filter 28.

The target optical system 23 includes a reflection mirror 31.
And a half mirror 7 and a concave mirror 8 similar to those of the visual acuity table presentation device of the first embodiment, and a light beam from each of the targets illuminated by the illumination system 22 is reflected by a reflection mirror 31 and a half mirror 7. By projecting toward the eye E by the action of the concave mirror 8, images of various optotypes including the stereoscopic target 5 are formed as virtual images at a distance of 5 m from the eye E, for example. Has become.

Reference numeral 20a denotes an opening for the eye E provided in the apparatus main body 20.

As shown in FIG. 11, in addition to the stereoscopic visual target 5 of the visual target plate 4, the rotating plate 21 has a hiragana visual target group 41, a Landolt ring visual target group 42, and a polarization test visual target. A target group 43, a red-green test target group 44, an astigmatism test target group 45, and the like are provided.

According to this visual acuity table presentation apparatus, various optometrists including the optotype 5 for stereoscopic vision are arranged in a circular shape on the rotating plate 21 which is driven to rotate, and the illumination system 22 controls the rotating plate 21. Since each target is illuminated with illumination light and the target optical system 23 forms the target image of each target at a position where the eye E can be visually recognized, the eye E can be used as the three-dimensional object. The images of the respective stereoscopic marks 11a to 13a of the visual target 5 can be visually recognized with different parallaxes, that is, in a state having a sense of depth, so that the stereoscopic vision of the subject's eye can be extremely easily formed without using polarized glasses or the like. Testing can be done. In addition, according to the visual acuity table presentation device, images of various optometrists can be presented to the eye E in addition to the stereoscopic optotype 5, so that a visual acuity test, astigmatism test, and the like of the eye E can be performed. Tests associated with various optometry can be performed.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS.

In the third embodiment of the present invention, a handle 51 as shown in FIGS. 13 and 14 is added to the optotype plate 4 provided with the optotype 5 for stereoscopic vision. The target plate 50 for stereoscopic vision is configured to be hand-held, and can be presented to the eye E to be examined.

According to the third embodiment, the examiner holds the stereoscopic visual target plate 50 in his / her hand and causes the eye E to visually recognize the stereoscopic visual target 5, whereby the subject's eye E The image of the stereoscopic mark of the visual target 5 can be visually recognized with different parallaxes, that is, in a state having a sense of depth, so that the stereoscopic vision test of the eye E can be performed extremely simply without using polarized glasses or the like. be able to.

[0036]

According to the first aspect of the present invention, the subject's eye can visually recognize the images of the plurality of stereoscopic marks of the stereoscopic visual target with different parallaxes, that is, with a sense of depth. Accordingly, it is possible to provide a visual acuity chart presenting apparatus that can extremely easily perform a stereoscopic vision test on the subject's eye without using polarized glasses or the like.

According to the second aspect of the present invention, it is possible to provide a stereoscopic visual target plate capable of performing a stereoscopic visual test of the subject's eye very simply without using polarized glasses or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of a visual acuity table presentation device according to a first embodiment.

FIG. 2 is a front view of the visual acuity table presentation device according to the first embodiment.

FIG. 3 is a cross-sectional view of the visual acuity table presentation device according to the first embodiment.

FIG. 4 is a front view showing a first transparent plate of the first embodiment.

FIG. 5 is a side view showing a first transparent plate of the first embodiment.

FIG. 6 is a front view showing a second transparent plate according to the first embodiment.

FIG. 7 is a front view showing a third transparent plate of the first embodiment.

FIG. 8 is a front view showing the optotype plate of the first embodiment.

FIG. 9 is a side view showing the target plate of the first embodiment.

FIG. 10 is a cross-sectional view of a visual acuity table presentation device according to a second embodiment.

FIG. 11 is a plan view of a rotating plate including a target plate used in the visual acuity table presentation device of the second embodiment.

FIG. 12 is a side view showing a target plate in a rotating plate used in the visual acuity table presentation device of the second embodiment.

FIG. 13 is a front view showing a target plate for stereoscopic vision according to a third embodiment.

FIG. 14 is a front view showing a target plate for stereoscopic vision according to a third embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device main body 2 Opening 4 Target plate 5 Target for stereoscopic vision 6 Target optical system 7 Half mirror 8 Concave mirror 11 First transparent plate 11a First stereoscopic mark 12 Second transparent plate 12a Second solid Visual mark 13 Third transparent plate 13a Third stereoscopic mark 20 Device body 21 Rotating plate 22 Illumination system 23 Visual target optical system 50 Visual target plate for stereoscopic vision

Claims (2)

[Claims] 1. An optotype plate provided with a plurality of transparent plates, each of which is provided with a plurality of marks at different positions and superimposed on each other, and a stereoscopic visual target of the optotype plate. A visual acuity table presentation device comprising: a visual target optical system that forms a visual target image of a target at a position where the eye to be inspected can be visually recognized. 2. An optotype plate for stereoscopic vision, comprising a plurality of stereoscopic marks having different parallaxes by an eye to be examined.