JP3501499B2 - Optometrist - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometer such as a optometer used in an ophthalmological hospital or an eyeglass store.

[0002]

2. Description of the Related Art Conventionally, in an optometry apparatus equipped with an optotype optical system capable of binocular vision, a method of presenting different optotypes to the left and right eyes by different optical systems has been adopted. In addition, a method of presenting a single visual target through separate lenses for the left and right eyes, a method of presenting a single visual target using a single large lens, and the like have been proposed.

[0003]

However, in the method of the above-mentioned conventional example, when observing different targets for the left and right eyes with different optical systems, there is a drawback that the visual field of the eye to be examined cannot be wide. is there. In addition, when using a lens having a diameter smaller than the interpupillary distance, a problem that convergence occurs due to the interpupillary distance of the subject occurs, and a lens having a diameter larger than the interpupillary distance must be used to solve this problem. I won't.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an optometry apparatus for binocular vision having a wide visual field that is not affected by switching between a distance vision test and a near vision test.

[0005]

An optometry apparatus according to the present invention for achieving the above object comprises an optotype projected onto an eye to be examined,
In an optometry apparatus having an optotype projection system having a concave mirror having a lateral diameter larger than the width of the eye to be inspected and a light splitting member obliquely provided between the concave mirror and the eye to be inspected, the optotype projection system is the light splitting member mark, and far vision inspection light path for projecting the eye passes through the light splitting member again after sequentially reflected by the concave mirror, the eye the visual target without going through the reflection of the concave mirror It has an optical path switching means for switching between a near vision inspection optical path to be projected, and arranges the visual target at a substantially focal position of the concave mirror in the far vision inspection optical path, and from the visual target position in the near vision inspection optical path. By making the optical path distance to the eye to be examined substantially equal to the focal length of the concave mirror ,
Of the target presented to the eye to be examined through the distance inspection optical path
It is presented to the eye to be inspected through the size and the optical path for near vision inspection.
It is characterized in that the size of the target is substantially equal .

[0006]

In the optometry apparatus of the present invention having the above-described structure, the light splitting member is provided between the concave mirror having a lateral diameter larger than the interpupillary width and the subject 's eye to enable optometry with both eyes. forming a far vision examination optical path using, near vision inspection light path so as to present the target to the subject without the use of concave mirrors, these light
Switch the optical path by means of optical path switching, and perform a distance inspection optical path and a near distance inspection.
The size of the optotypes to be presented to the examinee on the inspection path should be the same .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a configuration diagram of the first embodiment viewed from the side, FIG.
Is a configuration diagram viewed from above. In FIG. 1, the eye E to be inspected
An opening 1 as shown in FIG. 3 having left and right openings 1R and 1L for the examinee S to look into is provided on the front surface of the opening 1R,
On the optical axis O1 passing near the center of 1L, a concave mirror 3 having a width wider than the distance between the half mirror 2 and the openings 1R, 1L is arranged, and an optical axis O2 perpendicular to the optical axis O1 which is the incident direction of the half mirror 2. The target 4 is arranged on the upper side, and the illumination light source 5 is provided behind it. Further, an illumination light source 6 that illuminates the periphery of the optotype, which is a diffuse reflector, is provided diagonally in front of the optotype 4.

The central portion C of the visual target 4 is a liquid crystal for image display, and as shown in FIG. 4, the computer can turn on / off each element thereof to generate the visual acuity measurement mark M. The part C is illuminated by the illumination light source 5 at the rear and presented to the subject S.

In order to make the apparent size of the visual target 4 always constant, the distance from the concave mirror 3 to the eye E and the concave mirror 3
The distance from the target to the target 4 is almost the focus position of the concave mirror 3, and the half mirror 2 to the concave mirror 3 and the half mirror 2
The distance from the target to the target 4 is the same, and the half mirror 2 rotates 90 degrees around the rotation axis 2a on the optical axis O1 and can move to the position of the half mirror 2'shown by the dotted line. There is.

The left and right eyes EL and ER's line of sight OL and OR of the subject S are
In particular, at the time of distance inspection, two parallel lines of sight parallel to the optical axis O1 reach the concave mirror 3 via the half mirror 2. Therefore,
The horizontal diameter of the concave mirror 3 needs to be larger than the eye width which is the width of the two lines of sight OL, OR, but the vertical diameter may be small, and the shape of the concave mirror 3 may be substantially rectangular or elliptical. Further, if the opening 1L or the opening 1R of the opening 1 on the front surface of the left eye EL or the right eye ER is sequentially shielded, the inspection for each eye can be performed.

In the case of a distance inspection, when the illumination light source 6 is turned on and the target peripheral portion D of the target 5 is illuminated obliquely from the front, the reflected light flux from the target 4 is reflected by the half mirror 2 and the concave mirror 3. Then, the light flux that has entered the half mirror 2 again and has passed therethrough reaches the subject's eye E, and the subject S observes the optotype 4.
At this time, since the visual target 4 is at the focal position of the concave mirror 3, the visual target 4 is observed at a position farther than it appears.

In the case of near vision inspection, the half mirror 2 is set to 90.
The illumination light source 5 is turned on by rotating it to the position of the half mirror 2 '. The light source 5 illuminates the central portion C of the visual target 4 from behind, and the light flux from the visual acuity measurement mark M is reflected by the half mirror 2 '.
The subject directly observes the optotype 4 because it reflects light and directly reaches the eye E to be inspected. The subject determines the direction of the visual acuity measurement mark M,
This measures visual acuity.

In the case of the near vision inspection, the position of the visual target 4 may be brought closer to the optical axis O1 without rotating the half mirror 2. Further, in order to make the half mirror 2 as small as possible, it is preferable to arrange the half mirror 2 so that the reflection direction thereof is the vertical direction.

As described above, in this embodiment, a binocular vision inspection is performed, and since the visual target 4 can be shared by the left and right eyes, the visual field can be widened and the distance vision can be provided. convenient. Furthermore, since the visual target 4 is at the focal position of the concave mirror 3, the light flux emitted from one point of the visual target 4 becomes parallel light in front of the eye of the subject S, regardless of the size of the eye width of the subject S. The lines of sight OR and OL of the left and right eyes are always parallel, and similarly it is easy to obtain a distance vision.

It should be noted that the opening 1 having the openings 1R and 1L provided on the front surface of the eye E to be inspected as shown in FIG. 3 is used for positioning an eye when used as an automatic optometer for measuring a face close to the device. However, when used for subjective refraction measurement, it can be omitted because the target is observed using a temporary frame of a horopter or lens.

FIG. 5 shows a second embodiment, and the same symbols as in FIG. 1 indicate the same members. The plane mirror 10 is provided at a position approximately in the center of the distance between the concave mirror 3 and the eye E to be examined shown in the first embodiment, and the plane mirror 10 can be inserted into and removed from the optical path similarly to the second embodiment.

In the case of the distance inspection, the light beam from the target 4 is reflected by the half mirror 2 and the concave mirror 3 and again passes through the half mirror 2 to reach the eye E to be inspected, as in the first embodiment. The person S observes the optotype 4.

In the case of the near vision inspection, the light beam from the visual target 4 is reflected by the half mirror 2 and the plane mirror 10 inserted in the optical path 01, and then passes through the half mirror 2 to reach the eye E to be inspected. Can also observe the target 4. Also in this case, the plane mirror 1
If the distance from 0 to the concave mirror 3 and the distance from the plane mirror 10 to the subject's eye E are made the same, the apparent size of the optotype 4 at the time of switching from the distance examination to the near examination does not change.

[0019]

As described above, the optometry apparatus according to the present invention uses a concave mirror having a lateral diameter larger than the interpupillary distance, so that there is no natural distance in the distance vision regardless of the interpupillary distance. A visual feeling is obtained. Moreover, since a single visual target is observed by binocular vision, it is possible to take a wide field of view, and it is possible to perform an inspection with one eye or both eyes, and a near vision inspection is also possible.
Further, it is easy to switch between distance and near vision inspections, and the apparent size of the visual target can be kept unchanged.

[Brief description of drawings]

FIG. 1 is a side view of the first embodiment.

FIG. 2 is a configuration diagram viewed from above.

FIG. 3 is a front view of a light shielding plate.

FIG. 4 is a front view of an optotype.

FIG. 5 is a configuration diagram of a second embodiment.

[Explanation of symbols]

1, 11 opening 2 half mirror 3 concave mirror 4 Target 5, 6 light source 10 plane mirror

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Claims (3)

(57) [Claims] 1. An optotype projection system comprising an optotype projected onto an eye to be inspected, a concave mirror having a lateral diameter larger than an eye width of the eye to be inspected, and a light splitting member obliquely provided between the concave mirror and the eye to be inspected. the eye examination apparatus having the visual target projection system, the optotype the light splitting member, a far vision test optical path for projecting the eye passes through the light splitting member again after sequentially reflected by the concave mirror,
It has an optical path switching means for switching between the near vision inspection optical path for projecting the visual target onto the eye to be inspected without going through the reflection of the concave mirror, and the visual target is arranged at a substantially focal position of the concave mirror in the far vision inspection optical path. In addition, in the optical path for near vision inspection
By making the optical path distance from the target position to the eye to be inspected approximately equal to the focal length of the concave mirror, the distance inspection light is obtained.
The size of the visual target presented to the eye to be examined through the path and
Of the target presented to the eye to be examined via the optical path for near vision inspection
An optometry device characterized in that they are substantially equal in size . 2. The light splitting member is the concave mirror and the test object.
The optical path switching means is arranged substantially in the middle of the eye, and the optical path switching means is a rotating means by means of a member that rotates the light dividing member by 90 degrees. In the optical path for near vision inspection, the visual target is reflected by the light dividing means and the eye to be inspected. The optometry apparatus according to claim 1, wherein the optometry apparatus is configured to project the light onto the eye. 3. The optical path switching means comprises the concave mirror and the optical path switching means.
This plane mirror and a plane mirror placed almost in the middle of the eye to be inspected
And a means for inserting / removing into / from the optical path,
A material is arranged between the plane mirror and the eye to be inspected, and in the near vision inspection optical path, the target is the light splitting member, which is sequentially reflected by the plane mirror and then again passes through the light splitting member to the eye to be inspected. The optometry apparatus according to claim 1, wherein the optometry apparatus is configured to project.