JPH0510093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a subjective visual function testing device that includes an eye chart device and a reflection device.

(Prior art) Conventional visual function testing devices for subjectively testing visual functions such as visual acuity, stereopsis, and striae are
It is configured to have an eye chart installed at 3m to 5m for eye examination.

(Problem to be solved by the invention) When performing eye examination using such a subjective visual function testing device, it is necessary to increase the line of sight distance of the examinee so as not to affect the accommodative power of the eyes. There is.

For this reason, when using a conventional subjective visual function testing device, it is necessary to provide a large space for optometry, but in optical shops and ophthalmology clinics with small floor space, it is difficult to secure a large space for optometry. It was very difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a visual function testing device that has a simple configuration and is capable of performing eye examination in a narrow space.

(Means for Solving the Problems) In order to solve the above object, a first reflecting device is provided inside the housing to reflect the light beam from the visual acuity chart device, and a first reflecting device is placed outside the housing to reflect the light beam from the visual acuity chart device. The present invention is characterized in that the visual function testing device includes a second reflecting device that reflects the light beam from the first reflecting device toward the subject's eyes.

(Function) According to such a configuration, the light flux emitted from the visual acuity chart device is reflected in the order of the first reflection device and the second reflection device, and then heads toward the subject.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, on the top surface of the table housing 1,
There is a CRT2 for the examiner and a glass window 3.
Next to the CRT 2 is a keyboard 4 for operating the visual target.

In FIG. 1, reference numeral 5 denotes a fifth reflection mirror as a second reflection device located above the glass window 3, 6 a mirror support arm disposed on one side of the table 1, and 7 a part of the table 1. First leg on the side, 7a
is a mirror storage chamber formed entirely within the first leg portion 7;
Reference numeral 7b represents a lid for opening and closing the upper end opening of the mirror storage chamber 7a, and reference numeral 8 represents a second leg on the other side of the table 1.

The above-mentioned mirror support arm 6 includes a support column 6a that is extendable and retractable using a telescopic pipe (nesting tube), and a foldable support arm 6a that is attached to the upper end of the support column 6a so as to be horizontally rotatable in the direction of arrow A. Bent arm part 6
It is formed into a substantially L-shape from b. The support column 6a of the mirror support arm 6 is fixed to the bottom of the mirror storage chamber 7a. Furthermore, a mirror support member 9 is fixed to the tip of the bending arm portion 6b, and a fifth reflection mirror 5 is rotatable in the direction of arrow B at the bottom of the mirror support member 9 via angle adjustment devices 10, 10. Adjustably mounted. With this configuration, the fifth reflecting mirror 5 can be moved to the first position on the table 1 by the extension and contraction of the mirror support arm 6 when not needed.
It is stored in the leg portion 7, that is, in the mirror storage chamber 7a.

In FIG. 2, a mirror chamber 8a is formed entirely within the second leg portion 8 of the table 1, and a CRT for the subject is mounted on one low wall of the mirror chamber 8a.
21 is installed, and a reflective mirror 2 is mounted on the opposite wall.
2 is attached. A second reflective mirror 23 is attached to a wall facing the first reflective mirror 22, and a third reflective mirror 24 is held at the center of the upper part of the mirror chamber 8a. Furthermore, a fourth reflection mirror 25 is located below the glass window 3 on the top surface of the table 1.
is installed. Note that the CRT 2 displays the same optotype as the CRT 21 and also displays test data.

The light beam emitted from the CRT 21 is reflected several times between the first and second reflecting mirrors 22 and 23, and then reflected in the order of the third reflecting mirror 24, the fourth reflecting mirror 25, and the fifth reflecting mirror 5. It seems to be heading towards the front. Moreover, such first, second, third, and fourth reflecting mirrors 22, 23, 24, and 25 constitute a second reflecting device.

Next, the operation of the visual function testing device having such a configuration will be explained.

The CRT21 for the test subject and the CRT2 for the examiner include:
The same optotype formed by digital signals is displayed by operating the keyboard 8. for the test subject
After the light beam from the CRT 21 is reflected several times between the first reflection mirror 22 and the second reflection mirror 23, the direction of the light beam is changed by the third reflection mirror 24 toward the fourth reflection mirror 25 side. This changed luminous flux passes through the glass window 3, is changed in direction forward by the fifth reflecting mirror 5, and enters the eye of the subject 26.

In this embodiment, when the eye examination is not performed, the mirror support arm 6 with the fifth reflective mirror 5 attached can be stored inside the table 1, that is, in the mirror storage chamber 7a as shown by the broken line in FIG. 1, so that the consulting space and the eye examination space are can be made the same.

Furthermore, by using a CRT as the visual acuity chart device, the optotype is closer to hand compared to the conventional wall-mounted or projection type, making it easier to see the optotype, and a large number of images can also be produced. Furthermore, this CRT is separate for the test subject and for the examiner, allowing the examiner to check visual targets at hand.

In this embodiment, the lamps of the keys on the displayed keyboard may be lit without using the CRT 2 for the examiner.

In other embodiments, the visual acuity chart device may be configured with a projector and a screen instead of the CRT, or may be configured with a liquid crystal or a visual acuity card. In addition,
If an eye refractive power testing device is attached to the second reflecting device described above, eye refractive power can also be tested.

(Effects of the Invention) According to the present invention described above, the visual line of the subject is taken into the apparatus, so that the space for eye examination can be made smaller than in the past.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a visual function testing device showing an embodiment of the present invention, and FIG. 2 is a diagram showing the structure and optical path of a first reflecting device. 1...Table, 2...CRT for examiner, 3...
...Glass window, 5...Fifth reflecting mirror (second reflecting device), 21... Subject's CRT, 22... First reflecting mirror, 23... Second reflecting mirror, 24... Third reflecting mirror
Reflection mirror, 24...Fourth reflection mirror. (First reflection device).

Claims (1)

[Claims] 1. A first reflecting device disposed inside the housing to reflect the luminous flux from the visual acuity chart device, and a first reflecting device disposed outside the housing to reflect the luminous flux from the first reflecting device toward the subject's eyes. A visual function testing device consisting of two reflection devices.