JPH05277073A - Visual function inspector - Google Patents

Abstract

PURPOSE:To provide a visual function inspector which achieves a saving of space and a diversifying of eye inspecting pattern of a subject. CONSTITUTION:In a visual function inspector 1 which incorporates an optotypes display means 8 for displaying a target and an internal reflection system 10 to reflect a luminous flux from the target of the optotypes display means 8 outward with a specified length of an optical path into an optometric table 2 while the luminous flux from the internal reflection system 10 is led to the side of a subject through an external reflection system and a vision tester 6 for inspecting a visual function, an optical path length altering means is provided to change the length of the optical path of the internal reflection system 10 in a specified range. With such an arrangement, both of 5m-optometry and 3m-optomery can be selected at any time thereby achieving a saving of space and a diversifying of eye inspecting pattern of the subject.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual function inspection apparatus, and more particularly, to a visual function inspection apparatus for diversifying eye examinations of a subject and saving space.

[0002]

2. Description of the Related Art For example, a subject's subjective eye examination is performed.
In the visual function inspection device for performing the visual function inspection, a subjective eye examination device (vision tester) is provided above the eye examination table.
In general, a visual acuity table display means for displaying a visual target such as a Landolt mark is separately arranged at a position 5 m in front of the optometry table.

Further, for the purpose of saving space, a visual acuity table display means for displaying a visual target and an internal reflection system for reflecting a light beam from the visual target of the visual acuity table display means to the outside with a predetermined optical path length. There is also known a visual function inspection device which is built in an optometry table and which has an optometry means for guiding the light flux from the internal reflection system to the subject side through the external reflection system and the optometry means for visual function inspection.

[0004]

However, in the case of the above-mentioned conventional visual function inspection device, since the visual acuity chart display means is arranged at a position 5 m in front of the table, a considerable space is required as an installation place. However, there is a problem in that the visual function inspection device cannot be installed in a small spectacle store or the like which has only a small space.

Further, in the case of the conventional visual function inspection apparatus for the purpose of space saving, since the optical path length of the internal reflection system is set to, for example, a preset fixed optical path length for eye examination of 5 m, this visual function inspection is performed. The device has a problem that the 3m optometry cannot be performed.

[0006] Therefore, the present invention provides a visual function testing apparatus which has an improved structure and can save space, and can select both 5m and 3m optometry at any time to diversify the optometry. The purpose is.

[0007]

The invention according to claim 1 is
The visual acuity table display means for displaying the visual target and the internal reflection system for reflecting the light flux from the visual target of the visual acuity table display means to the outside with a predetermined optical path length are built in the optometry table, and the internal reflection system is also provided. In the visual function inspection device having an optometry means for guiding the light flux from the inside of the subject to the subject side through an external reflection system and an optometry means for visual function inspection, an optical path for changing the optical path length of the internal reflection system within a predetermined range. The length changing means is provided.

According to a second aspect of the present invention, the optical path length changing means is an auxiliary optometry table which holds a part of a mirror group forming an internal reflection system, and another optical reflection table display means and an internal reflection system. It is arranged such that it can be inserted into and removed from an optometry table holding a mirror group.

[0009]

The operation of each of the above-mentioned inventions will be described below.

According to the visual function testing device of claim 1,
Built in the optometry table, the optical path length changing means for changing the optical path length of the internal reflection system for reflecting the light flux from the visual target of the visual acuity table display means to the outside with a predetermined optical path length within a predetermined range is provided. If necessary, the optical path length changing means can change the optical path length of the internal reflection system to, for example, 5 m optometry or 3 m optometry, so that the optometry of the subject can be performed, and the optometry mode can be diversified. Become.

According to the visual function testing device of claim 2,
The optical path length changing means, an auxiliary optometry table holding a part of the mirror group constituting the internal reflection system, with respect to the optometry table holding the visual acuity table display means and another mirror group constituting the internal reflection system Since it is configured so that it can be inserted and removed,
For 5m optometry, pull out the auxiliary optometry table from the optometry table, and for 3m optometry, insert the auxiliary optometry table on the optometry table side for 5m optometry
The optical path length for optometry can be selectively set, and the optometry mode can be diversified.

Further, by inserting the auxiliary optometry table into the optometry table side during non-examination, the area occupied by this visual function testing device can be reduced and space can be saved.

[0013]

EXAMPLES Examples of the present invention will be described in detail below.

The visual function inspection apparatus 1 shown in FIG. 1 comprises an optometry table 2 and an auxiliary optometry table 3 which is arranged so that it can be inserted into and removed from the optometry table 2.

A column 4 is erected at the end of the optometry table 2, and an arm 5 attached to the column 4 supports an optometry unit 6 for subjective optometry. Further, an external mirror 7 as an external reflection device is arranged near the optometry window 6a of the optometry means 6 in a state of being suspended from the arm 5.

On the optometry table 2, a control box 11 which is an operating means for inputting various operations of the visual function inspection apparatus 1 and having a display section 12 for displaying various information is arranged. is doing.

Inside the optometry table 2, as shown in FIG. 2, a visual acuity table display means 8 for displaying visual targets such as a Landolt mark M for visual function inspection, and the visual acuity table display means 8 are provided. And an internal reflection system 10 for reflecting the luminous flux of the above from the opening 9 provided in the optometry table 2 toward the external mirror 7.

The internal reflection system 10 is a visual acuity chart display means 8
And the first mirror 13 facing the
A second mirror 14 arranged below the second mirror 1 and a second mirror 1
From the fourth mirror 16; a third mirror 15 that reflects the light flux from 4 upward; a fourth mirror 16 that reflects the light flux from the third mirror 15 in the same direction as the table surface of the optometry table 2; Light flux of the external mirror 7 through the opening 9.
And a fifth mirror 17 that reflects toward.

The first and second mirrors 13 and 14 are
It is held by an auxiliary optometry table 3 that constitutes an optical path length changing means that can be inserted into and removed from the optometry table 2.

The optometry table 2 also includes a third mirror 1
5, a fourth mirror 16 and a fifth mirror 17 are arranged.

As shown in FIGS. 1 and 2, the auxiliary optometry table 3 is constructed by engaging a rail 18 provided on the side surface thereof with a guide 19 provided in the receiving hole 2a of the optometry table 2. It can be inserted into and removed from the optometry table 2 in a direction (arrows X1 and X2 directions) toward and away from the visual acuity table display means 8. At the bottom of the auxiliary optometry table 3,
The casters 20 are arranged so as to move smoothly.
Further, the moving distances of the auxiliary optometry table 3 in the directions of the arrows X1 and X2 are detected by the encoder 21 as an optical path length detecting section.

FIG. 4 shows a control system of the visual function inspection device 1.

The visual function inspection device 1 includes a control means 30 including a program memory 32 storing an operation program and a CPU 31 for controlling the whole.

With respect to the CPU 31, the optometry means 6, the visual acuity chart display means 8, the control box 11,
It is connected to the encoder 21.

Next, the operation of the visual function inspection device 1 described above will be described.
This will be described with reference to FIGS. 2, 3 and 5.

First, with this visual function inspection device 1, 5 m
When performing the optometry, as shown in FIG. 2, the auxiliary optometry table 3 is pulled out from the optometry table 2 in the arrow X2 direction.

At this time, from the visual acuity chart display means 8 to the first
Optical path length from the second mirror 14 to the third
As shown in FIG. 2, the optical path length to the mirror 15 is long, and as a result, an optical path length for 5 m optometry can be secured.

The moving distance of the auxiliary optometry table 3 when performing the 5m optometry is detected by the encoder 21, and as shown in FIG.
When the optical path length for optometry is 5 m based on a preset operation program, the display unit 12 displays “optical path length 5 m”.
Is displayed. This allows the examiner to reliably install the auxiliary optometry table 3 at the 5m optometry position.

Although not shown, the auxiliary optometry table 3 is positioned at the 5m optometry position by a click mechanism extending over the rail 18 and the guide 19. 3m described later
The positioning at the optometry position is similar.

Next, when performing a 3 m optometry, as shown in FIG. 3, the auxiliary optometry table 3 is inserted in the direction of arrow X1 with respect to the optometry table 2, and the display of the display unit 12 displays "optical path length". 3m ”.

As a result, the optical path length from the visual acuity chart display unit 8 to the first mirror 13 and the optical path length from the second mirror 14 to the third mirror 15 are changed to 3 m for optometry, and as a result, 3 m. An optometry can be performed.

In this case, the visual target such as the Landolt mark of the visual acuity chart display means 8 is switched from 5 m optometry to 3 m optometry.

To switch between the 5 m optometry target and the 3 m optometry target, both targets are built in the visual acuity chart display means 8.
These may be switched in association with the displacement of the auxiliary optometry table 3, or the same optotype may be displayed for 5 m optometry and 3 m optometry with different sizes depending on the visual acuity value.
The conversion of the size of the optotype can be easily realized when a liquid crystal display is used as the visual acuity table display means 8.

Further, the conversion of the size of the visual target is, for example, 3
This can also be realized by inserting a correction lens with a predetermined magnification in the optical path of the internal reflection system 10 during the optometry.

Further, when the visual function testing device 1 is not used or when the visual function testing device 1 is carried, the auxiliary optometric table is further inserted into the optometric table 2 side. As a result, the area occupied by the visual function inspection device 1 can be further reduced, space can be saved, and transportation can be facilitated.

The present invention is not limited to the above-mentioned embodiment, but various modifications can be made.

[0037]

According to the present invention described in detail above, since it has the above-mentioned configuration, it is possible to provide a visual function inspection device capable of saving space and diversifying eye examination modes of a retractor. You can

[Brief description of drawings]

FIG. 1 is an external configuration diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an optical system of an apparatus according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a 3 m optometry state of an apparatus according to an embodiment of the present invention.

FIG. 4 is a block diagram showing a control system of an apparatus according to an embodiment of the present invention.

FIG. 5 is a plan view showing a display mode of a display unit of the device according to the embodiment of the present invention.

[Explanation of reference numerals] 1 visual function inspection device 2 optometry table 3 auxiliary optometry table 6 optometry means 7 external mirror 8 visual acuity table display means 10 internal reflection system

Claims (2)

[Claims] 1. An optometry table includes a visual acuity table display means for displaying a visual target and an internal reflection system for reflecting a light flux from the visual target of the visual acuity table display means to the outside with a predetermined optical path length. In the visual function inspection device including an optometry means for guiding the light flux from the internal reflection system to the subject side through the external reflection system and the optometry means for visual function inspection, the optical path length of the internal reflection system is set to a predetermined value. A visual function inspection device characterized in that an optical path length changing means for changing the range is provided. 2. The optical path length changing means comprises an auxiliary optometry table holding a part of a mirror group forming an internal reflection system,
The visual function inspection device according to claim 1, wherein the visual function inspection device is configured to be removably arranged with respect to an optometry table that holds a visual acuity table display means and another mirror group that constitutes an internal reflection system.