JPH0576848B2 - - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subjective visual function testing device that includes an eye chart device and a reflection device.

[0002]

[Prior art] Conventional subjective methods for visual acuity, stereoscopic vision,
A visual function testing device for testing visual functions such as tropism is configured so that an eye chart is provided 3 m to 5 m in front of a subject for eye examination.

【0003】

[Problems 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 be affected by the accommodative power of the eye. be.

[0004] For this reason, when using a conventional subjective visual function testing device, it is necessary to provide a large space for the eyes, but in optical shops and ophthalmology clinics with small floor space, it is necessary to secure a large space for eye examination. That was difficult.

[0005] As a solution to this problem, there is provided a housing that includes a visual acuity chart device, a first reflecting device that is disposed inside the housing and reflects the luminous flux from the visual acuity chart device, and a first reflecting device that is disposed on the top of the housing. It is conceivable to construct a visual function testing device from the first reflecting device and a second reflecting device that reflects the luminous flux from the first reflecting device toward the subject's eyes.

[0006] In this case, it is desirable that the height of the second reflection device can be adjusted to match the height of the subject's eyes.

[0007] The present invention meets this demand and also aims to provide a visual function testing device in which the height of the second reflection device can be adjusted to match the height of the subject's eyes.

[0008]

[Means for Solving the Problems] In order to solve the above-mentioned object, the present invention includes a first reflecting device disposed inside a housing to reflect the light beam from the visual acuity chart device, and a first reflecting device disposed inside 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 comprises a second reflecting device that is movably supported by a support means and reflects the luminous flux from the first reflecting device toward the subject's eyes.

[0009]

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

[0010] In FIG. 1, table 1 (housing)
On the top surface, there is a CRT 2 for the examiner and a glass window 3, and next to the CRT 2 for the examiner there is a keyboard 4 for operating the optotype.

[0011] In FIG. 1, 5 is a fifth reflecting mirror as a second reflecting device located above the glass window 3;
6 is a mirror support arm disposed on one side of the table 1; 7 is a first leg on the one side of the table 1; 7a is a mirror storage chamber formed entirely within the first leg 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.

[0012] The above-mentioned mirror support arm 6 (supporting means) includes a support section 6a that is extendable and retractable using a telescopic pipe (nested tube),
It is formed into a substantially L-shape with a bending arm portion 6b attached to the upper end of the support portion 6a so as to be horizontally rotatable in the direction. 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 this mirror support member 9
A fifth reflecting mirror 5 is located at the bottom of the angle adjusting device 1.
0 and 10 so that the rotation can be adjusted in the direction of arrow B. With this configuration, the fifth reflecting mirror 5
is stored in the first leg portion 7 of the table 1, that is, in the mirror storage chamber 7a, by the expansion and contraction of the mirror support arm 6 when not needed.

[0013] In FIG. 2, a mirror chamber 8a is formed entirely within the second leg portion 8 of the table 1, and a CRT 21 for the subject (visual vision A reflective mirror 22 is attached to the opposite wall. 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. Further, a fourth reflecting mirror 25 is disposed below the glass window 3 on the top surface of the table 1. still,
The CRT 2 displays the same optotype as the CRT 21 and also displays test data.

[0014] The light flux emitted from the CRT 21 is reflected several times between the first and second reflection mirrors 22 and 23, and then reflected in the order of the third reflection mirror 24, the fourth reflection mirror 25, and the fifth reflection mirror 5. , facing the front of table 1. Moreover, such first, second, third, fourth reflecting mirrors 22, 23, 24, 2
5 constitutes a second reflection device.

[0015] Next, the operation of the visual function testing device having such a configuration will be explained.

[0016] CRT21 for the test subject and CRT for the examiner
2, identical optotypes formed by digital signals are displayed by operating the keyboard 8. After the light beam from the CRT 21 for the subject 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. be changed to. 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.

[0017] In this embodiment, when the eye examination is not performed, the fifth
The mirror support arm 6 with the reflective mirror 5 is placed inside the table 1, that is, in the mirror storage chamber 7a.
Since it can be stored as shown by the broken line in the figure, the consulting space and optometry space can be made into the same space.

[0018] Furthermore, by using a CRT as the visual acuity chart device, the optotype is closer to hand compared to the conventional wall-mounted type or projection type, so the optotype is easier to see, and a large number of images can be produced. Furthermore, this CRT is separate for the test subject and for the examiner, allowing the examiner to check visual targets at hand.

[0019] In this embodiment, the key lamps on the displayed keyboard may be turned on without using the CRT 2 for the examiner.

[0020] In another embodiment, an eye chart device is used.
Instead of a CRT, it may be constructed of a projector and a screen, or it may be constructed of a liquid crystal display or a vision card. Note that if an eye refractive power testing device is attached to the second reflecting device described above, eye refractive power can also be tested.

[0021]

[Effects] According to the present invention as described above, the space for eye examination can be made smaller compared to the conventional method by taking the subject's line of sight into the device.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a visual function testing device showing one embodiment of the present invention.

FIG. 2 is a diagram showing the configuration and optical path of the first reflecting device in FIG. 1;

[Explanation of symbols]

1...Table (housing) 2...CRT (vision chart device) for examiner 3...Glass window 5...Fifth reflecting mirror (second reflecting device) 6...Mirror support arm (support means) 21... Subject's CRT (vision chart device) 22...First reflecting mirror (part of the first reflecting device) 23...Second reflecting mirror (part of the first reflecting device) 24...Third reflecting mirror (part of the first reflecting device) 25...Fourth reflecting mirror (part of the first reflecting device)

Claims (1)

[Claims] 1. A first reflecting device disposed inside a housing to reflect the luminous flux from the visual acuity chart device; A visual function testing device comprising: a second reflecting device that reflects a luminous flux toward the subject's eyes.