JPH11332829A - Optometry device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the size of an optical system to a compact configuration. SOLUTION: Cornea measuring light sources 21a to 21d project a light beam onto the cornea from outside a light dividing member 1. The images of the corneal reflection images of the light sources 21a to 21d reflected on the area sensor 7 are taken into the calculation means, the positions of these corneal reflection images are calculated, the radius of curvature of the cornea is obtained, and the positioning information is obtained.
In the refraction measuring optical system, the objective lens 8 of the measuring optical system is used.
And the distance from the objective lens 2 of the optotype optical system to the subject's eye E affects the size of the entire optical system.
The light sources 21a to 21d can be arranged in a layered manner with the measurement optical system by projecting light beams from the light splitting member 1 from the outside of the light splitting member 1, so that the distance from the objective lenses 2, 8 to the eye E to be inspected can be reduced. The length of the optical system can be reduced, and the size of the optical system can be reduced as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometric apparatus such as an auto-refractometer or an auto-keratometer used in an eyeglass store or an ophthalmic hospital.

[0002]

2. Description of the Related Art Conventionally, in a multifunction machine of an auto-refractometer and an auto-keratometer, a corneal measurement light source is disposed in front of a measurement light receiving optical system.

[0003]

However, the above-mentioned prior art has a problem that the optical system becomes large and the configuration becomes complicated as a whole because of the combined function of the auto-refractometer and the auto-keratometer. .

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a compact optometry apparatus by downsizing an optical system.

[0005]

According to the present invention, there is provided an optometry apparatus for projecting a light beam onto a cornea of an eye to be inspected, and photoelectrically detecting the reflected light to determine the shape of the cornea. And a refraction measuring optical system for projecting a light beam onto the fundus and photoelectrically detecting the reflected light to obtain a refraction value, the direction including at least three meridians separated in a predetermined meridian direction around the optical axis of the optometry. A corneal measurement light source provided in
A light splitting member for splitting an optical path provided in the measurement optical system, wherein the light splitting member reflects an optical path in a separate meridian direction of the corneal measurement light source, and the split measurement optical system and the corneal measurement Characterized in that the light sources are arranged in layers.

An optometry apparatus according to the present invention includes a corneal measurement optical system for projecting a light beam onto a cornea of an eye to be examined and photoelectrically detecting a reflected light thereof to obtain a shape of the cornea, and a corneal measurement optical system for projecting a light beam to a fundus of the eye to reflect the reflected light. An optometric apparatus comprising: a refraction measuring optical system for detecting a refraction value by photoelectrically detecting a corneal measurement light source provided in a direction including at least three meridians separated in a predetermined meridian direction around the optometry optical axis; A light splitting member for splitting an optical path of the optical system, the light splitting member reflects the light path in a meridian direction separated from the corneal measurement light source, and the corneal measurement is performed from outside the light splitting member within the reflection surface. Light is projected onto the cornea of the subject's eye.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. 1 is a plan view of an optical system of an optometry apparatus according to an embodiment, FIG. 2 is a side view, and FIG. 3 is a front view. On an optical path O1 in front of an eye E to be inspected, a light division that divides an optical path in a plane is provided. A member 1, an objective lens 2, a dichroic mirror 3, which reflects visible light, a telecentric aperture 4, a lens 5, a dichroic mirror 6, and an area sensor 7 serving as an image pickup means are sequentially arranged. Conjugated to the eye.

The optical path O1 is split in a plane by the light splitting member 1, and on the split optical path O2, an objective lens 8, a mirror 9, a perforated mirror 10, and a small aperture stop 1 conjugate with the anterior segment.
1, a lens 12, and a refraction measurement light source 13 of an infrared LED are sequentially arranged. On the optical path between the dichroic mirror 6 and the perforated mirror 10, the conjugate with the anterior ocular portion from the perforated mirror 10 side. 6 aperture stop 14, separation prism 15,
The lenses 16 are arranged, and the area sensor 7 is conjugated to the ocular fundus via the optical path O3.

On the optical path O3 in the incident direction of the dichroic mirror 3, a lens 17, a mirror 18, a lens 1
9, a target 20 common to refraction measurement and corneal measurement is arranged, and near the light splitting member 1, corneal measurement light sources 21a to 21d composed of infrared LEDs are arranged at an angle of 45 with respect to the optical path O1.
Are arranged in the radial direction. In other words, the corneal measurement light sources 21a to 21d are arranged in layers above and below the measurement optical system that has been optically split in a plane by the light splitting member 1.

The target 20 projects a target light beam to the eye E through the lens 19, the mirror 18, the lens 17, the dichroic mirror 3, the objective lens 2, and the light splitting member 1. The refraction measurement light source 13 includes a lens 12, a small aperture stop 11, a perforated mirror 10, a mirror 9, an objective lens 8, and a light splitting member 1.
, A spot light beam is projected on the fundus of the eye E to be examined.
The reflected light returns along the same optical path, is reflected by a perforated mirror 10, is separated into six spot lights by a six-hole stop 14 and a separation prism 15, and is transmitted to an area sensor 7 via a lens 16 and a dichroic mirror 6. Received as a light beam,
The refraction value is obtained by calculating the positions of the light beams.

The corneal measuring light sources 21a to 21d project a light beam from the outside of the light dividing member 1 onto the cornea of the eye E to be examined. The images of the corneal reflection images of the light sources 21a to 21d reflected on the area sensor 7 are taken into the calculation means, the positions of these corneal reflection images are calculated, the radius of curvature of the cornea is obtained, and the positioning information is obtained.

In the refraction measuring optical system, the eye E to be inspected from the objective lens 8 of the measuring optical system and the objective lens 2 of the target optical system.
Although the distance to the optical system affects the size of the entire optical system, the light sources 21a to 21d are projected from the outside of the light dividing member 1 by projecting the light beams from the corneal measuring light sources 21a to 21d, so that the light sources 21a to 21d are arranged in layers with the measuring optical system. Therefore, the distance from the objective lenses 2 and 8 to the eye E can be shortened,
The size of the optical system can be reduced as a whole.

The astigmatic angle can be calculated by using at least three corneal measurement light sources 21a to 21d in different meridian directions. The upper part between the light sources 21a and 21d and the light source 2
Another corneal measurement light source may be arranged below 1b and 21c, respectively, and measurement may be performed using a total of six light source images. In addition, four light sources other than between light sources 21d and 21c are connected in a continuous circle. One arc-shaped light source may be used. Note that the target optical system may be divided by the light dividing member 1 on the eye E side of the measurement optical system. However, in this case, the light source 21a
And 21b are also separate light sources.

[0014]

As described above, in the optometry apparatus according to the present invention, the optical path is reflected by the light splitting member in the direction of the meridian separated from the corneal measurement light source, and the divided measurement optical system and the corneal measurement light source are layered. In this case, the optical system can be reduced in size, and a compact multifunction peripheral having the functions of refractive power measurement and corneal curvature measurement can be provided.

Further, in the optometry apparatus according to the present invention, the optical path is reflected by the light dividing member in the meridian direction separated from the light source for corneal measurement, and the corneal measurement light from the outside of the light dividing member is reflected from the outside of the light dividing member within the reflecting surface. By projecting the image on the cornea, the size of the optical system can be reduced, and a compact multifunction peripheral having functions of refractive power measurement and corneal curvature measurement can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical system of an optometry apparatus according to an embodiment.

FIG. 2 is a side view.

FIG. 3 is a front view.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light splitting member 3, 6 dichroic mirror 4 telecentric stop 7 area sensor 10 perforated mirror 11 small aperture stop 13 light source for refraction measurement 14 6-hole stop 15 separation prism 20 targets 21 a to 21 d light source for corneal measurement

Claims (2)

[Claims] A corneal measurement optical system for projecting a light beam onto a cornea of an eye to be examined and photoelectrically detecting a reflected light thereof to obtain a shape of the cornea;
A refraction measuring optical system for projecting a light beam onto the fundus and photoelectrically detecting the reflected light to obtain a refraction value, the refraction measuring optical system being provided in a direction including at least three meridians separated in a predetermined meridian direction around the optometry optical axis. A light source for corneal measurement, and a light splitting member for splitting an optical path provided in the measurement optical system, the light splitting member reflects the light path in a meridian direction of the light source for corneal measurement, and the light is split. An optometry apparatus, wherein a measurement optical system and the corneal measurement light source are arranged in a multilayer structure. 2. A corneal measuring optical system for projecting a light beam onto a cornea of an eye to be examined and photoelectrically detecting a reflected light thereof to determine a shape of the cornea;
A refraction measuring optical system for projecting a light beam onto the fundus and photoelectrically detecting the reflected light to obtain a refraction value, the refraction measuring optical system being provided in a direction including at least three meridians separated in a predetermined meridian direction around the optometry optical axis. Light source for corneal measurement, and a light splitting member for splitting the optical path of the measurement optical system, the light splitting member reflects the optical path in the direction of the separate meridian of the light source for corneal measurement, within the reflection surface An optometric apparatus, wherein corneal measurement light is projected onto the cornea of an eye to be examined from outside the light splitting member.