JP3348952B2 - Eye test - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyesight inspection apparatus for inspecting the eyesight of an eye to be inspected, and more particularly to an eyesight inspection apparatus suitable for checking the appearance of a progressive multifocal lens.

[0002]

2. Description of the Related Art The accommodation power of the human eye becomes
It gradually decreases, making it impossible to focus on a short distance. When accommodation power decreases, glasses for correcting near refractive power are required, but those who need correction for distance refractive power require glasses with multiple functions for distance vision and near vision. It is necessary to have At present, bifocal and triple-focal multifocal lenses and progressive multifocal lenses are widely sold in order to eliminate the inconvenience of having a plurality of spectacles. Progressive multifocal lenses that allow continuous clear vision without distraction have become widespread.

[0003] Which multifocal lens is used to make glasses
It is necessary to present a far vision target or a near vision target to the eye to be examined, and to sufficiently determine the appearance thereof before making a determination. Also, progressive multifocal lens manufacturers propose lenses with various optical designs, but each has its merits, but there is a problem that it does not fit the examinee, so it is necessary to check the appearance. Is particularly high.

Japanese Patent Publication No. Sho 63-28613 (name of the invention, a visual impairment inspection apparatus) includes three types of distance use, near use and intermediate use.
There has been proposed a visual acuity test apparatus in which there are optotype optical paths at two test distances, and three optical paths corresponding to each of the optical paths are arranged.

[0005]

However, in the device disclosed in Japanese Patent Publication No. 63-28613, the openings corresponding to the respective optical paths are independent, so that they are far from the ordinary visual environment using glasses. There was a problem that. Further, there is a disadvantage that an optical system arranged in the apparatus is complicated, and the manufacturing cost is high.

SUMMARY OF THE INVENTION An object of the present invention is to provide a visual acuity testing apparatus capable of performing a visual acuity test at different test distances in a state close to a daily visual environment in view of the above-mentioned drawbacks of the conventional apparatus.

Another object of the present invention is to provide a visual acuity inspection apparatus having an optical system for performing inspection at a plurality of simplified inspection distances.

It is a further object of the present invention to provide a visual acuity inspection apparatus that can perform visual acuity measurement at different inspection distances from a single inspection window.

[0009]

Means for Solving the Problems The present invention is characterized by having the following configuration in order to achieve the above object. (1) Arrange beam splitter and concave mirror in housing
The target beam transmitted through the beam splitter is transmitted to the concave
The beam is reflected by the surface mirror and guided again to the beam splitter,
The target light beam from the splitter is guided to the eye
In a visual acuity inspection apparatus for inspecting visual acuity of an optometry, the concave surface
A long distance inspection optical path using a mirror, and
Inspection distances for short and intermediate distance inspection optical paths
An optotype presenting means for presenting an optotype corresponding to the separation;
Face the subject's eye to view the optotype
One inspection window provided at the position facing
In the optotype presenting means, distance and near optotypes
Presentation of the optotype so that presentation is performed simultaneously to the subject
And control means for controlling

[0010]

[0011]

[0012]

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the optical system when the apparatus of the present embodiment is viewed from the right side, and FIG. 2 is a perspective view of the optical system when viewed from the front.

Reference numeral 1 denotes a subject's eye, and reference numeral 2 denotes a visual acuity test apparatus.
A single window 3 is arranged in the visual acuity test apparatus 2 facing the subject's eye 1, and the subject's eye 1 can see a target through this window 3. The window 3 is covered with a translucent filter 4,
Antireflection films are applied to both surfaces of the semi-transmissive filter 4 so that external light reflected by the semi-transmissive filter 4 does not enter the subject's eye 1. The inside of the housing of the eyesight inspection device 2 is painted black, and the eye 1
The internal structure of has become inconspicuous.

Reference numeral 5 denotes a distance vision optical axis. Reference numeral 6 denotes a single disc-shaped optotype plate made of glass or the like. On the same circumference of the optotype plate 6, an optotype for distance inspection 7 is drawn by chromium evaporation. The optotype plate 6 is rotatably driven by the optotype plate motor 8, and switches and presents the far-distance test optotype 7 to be presented. Reference numeral 9 denotes a mask plate provided with an opening for partially presenting a visual acuity test for distance vision, and the like. The mask plate 9 is rotated by a mask plate motor 10 to apply a necessary mask to the visual target.

Reference numeral 11 denotes an illumination lamp.
The luminous flux of the distance test target 7 illuminated by the
The light is reflected upward by 2 and transmitted through the beam splitter 13, and then reflected by the concave mirror 14. Concave mirror 1
Reference numeral 4 optically extends the inspection optical axis to almost infinity. The light beam reflected by the concave mirror 14 is transmitted to the beam splitter 13.
Is reflected by the front surface 13a of the subject, passes through the window 3, and
Reaches

The tilt angle of the beam splitter 13 is changed by a motor as angle changing means for changing the angle of the beam splitter, which will be described later, as shown at 13 'in FIG.
The angle of the distance vision inspection optical axis 5 can be changed according to the height of the subject's eye 1.

Reference numeral 15 denotes an optical axis for measuring visual acuity at an intermediate distance.
Reference numeral 16 denotes a target for the intermediate distance. The light flux of the target for the intermediate distance illuminated by the illumination lamp 17 is reflected by the mirror 18, passes through the beam splitter 13 and the window 3, and passes through the eye 3. Reaches From the target 16 for the intermediate distance to the subject's eye 1
The distance up to about 50 cm.

Reference numeral 19 denotes a near vision test optical axis, and a target luminous flux of a near test target 21 illuminated by an illumination lamp 20 reaches the eye 1 of the subject through the window 3. Short range target 2
The distance from the eye 1 to the eye 1 is about 30 cm. .

The distance vision test optical axis 5, the intermediate distance vision test optical axis 15, and the near vision test optical axis 19 correspond to a distance vision section, a near vision section, and a progressive zone corresponding to a standard progressive multifocal lens, respectively. And the optotype of the inspection optical path can be seen through each distance portion, near portion, and progressive zone.

The operation of the apparatus having the above configuration will be described with reference to the electric system block diagram of FIG. The device can be used as a device for inspecting each function of the distance vision test and the near vision test as well as the conventional vision test device, but the description is omitted here, and the conventional device is not provided. A special usage will be described.

When the subject is positioned at a predetermined position on the front and a progressive mode switch arranged on the control switch 30a is pressed, the control unit 31 receives the signal and receives the signal.
The illumination lamps 11, 17, and 20 are simultaneously turned on via the lights 2, 33, and 34, thereby illuminating the distance test target 7, the intermediate distance test target 16, and the near test target 21.

Next, when an angle changing switch arranged on a control switch 30b arranged near the subject is operated, the control unit 31 drives a motor 36 for changing the angle of the beam splitter via a driver 35. Then, the inclination angle of the beam splitter 13 is changed. When the distance target 7 is adjusted so that it can be viewed at a predetermined position (the center in the present embodiment) of the beam splitter 13, the target select switch provided on the control switch 30a is operated to operate the target. Make a selection. The control unit 31 drives the optotype plate motor 8 via the driver 37 and sets the optotype corresponding to the input switch signal on the distance vision optical axis 5.

In this way, the subject is presented with the three targets for distance, near, and intermediate distances at the same time. You can know the degree of your eyesight.

[0025] Further, for the test subject (or own)
By presenting three optotypes at the same time with the progressive lens on, the subject can be made to feel the appearance (similarly, the distance visual acuity test optotype 7 and the near visual acuity). A mode for selecting only the test target 21 can be prepared to perform the test for the bifocal lens).

The above embodiment can be variously modified without changing the technical idea of the present invention. That is, for example, the driving of the angle changing motor 36 is performed by a switch operation. However, a detecting device for detecting the vertical position of the subject's eye 1 is provided, and the driving is controlled by a signal from the detecting device. You may do it.

Although the inspection distance for long-range visual acuity measurement is set to infinity, the inspection distance may be set to a finite distance such as 5 m, the target plate 6, the target plate motor 8, the mask plate 9, the mask plate motor 1 and the like.
0, a moving means for moving the distance vision target assembly 22 including the illumination lamp 11 and the mirror 12 in the upward direction (upward in FIG. 2) can be provided so that the inspection distance can be moved to 5 m or the like. It can respond to various inspection applications.

Further, the apparatus may be provided with a storage medium for storing the programmed order of the selection of the optotypes, so that the optotypes are automatically switched.

[0029]

As described above, according to the visual acuity test apparatus of the present invention , different test distances are obtained in a state close to a daily visual environment.
Eyesight test can be performed. Also, different inspection distance
By presenting the separated target at the same time, it is possible to confirm the appearance in the actual wearing state.

Further, according to the present invention, the optical system for performing inspection at a plurality of inspection distances can be simplified, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an optical system when an apparatus according to an embodiment is viewed from a right side.

FIG. 2 is a perspective view of an optical system when the apparatus of the embodiment is viewed from the front.

FIG. 3 is an electric block diagram of the apparatus of the embodiment.

[Explanation of symbols]

 2 visual acuity test device 3 window 5 distance vision test optical axis 7 distance test visual target 15 intermediate range visual test optical axis 16 intermediate distance test visual target 19 near vision test optical axis 21 near test visual target

Claims (1)

(57) [Claims] 1. A beam splitter and a concave mirror in a housing.
The target light flux transmitted through the beam splitter
The light is reflected by the concave mirror, guided again to the beam splitter, and
Guides the luminous flux from the beam splitter to the eye to be examined.
A visual acuity test apparatus for testing the visual acuity of the subject's eye,
Inspection optical path for long distance using concave mirror and using concave mirror
Inspection paths for the near and intermediate distances
An optotype presenting means for presenting an optotype corresponding to the inspection distance;
The subject's eye of the housing to view the optotypes of the plurality of inspection light paths
One inspection window provided at a position facing the eye and an eyesight test
The distance and near vision in the optotype presenting means at times
So that the target is presented to the subject at the same time.
A visual acuity test apparatus , comprising: control means for controlling presentation .