JPS62144632A - Automatic vision analyser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic visual acuity meter that measures the visual acuity based on the responses of the eye while presenting a plurality of optotype marks.

[Prior art 1] Conventional visual acuity meters measure so-called single-character visual acuity by presenting optotype marks one at a time; It is generally said that the measured visual acuity is different from the normal visual acuity that is measured, and there is a demand for an automatic visual acuity meter that uses a conventional method.

[Object of the Invention] In order to solve the above-mentioned problems, an object of the present invention is to provide an automatic visual acuity meter that can measure visual acuity by displaying a large number of optotype marks.

[Summary of the Invention] The gist of the present invention for achieving the above-mentioned object is to provide a reflective type that displays a plurality of optotype marks of different sizes and has a light-transmitting part provided near each optotype mark. A visual acuity target board, an illumination light source that illuminates the target board from the front, an instruction light source disposed behind the light transmitting section at the optotype mark, and each of the instruction light sources individually turned on to illuminate the visual target board. The automatic visual acuity meter is characterized by comprising a control unit that specifies a reference mark.

[Embodiments of the invention] The present invention will be explained in detail based on illustrated embodiments.

Fig. 1 is a top view of the optotype section of an automatic visual acuity meter, and Fig. 2 is a cross-sectional view thereof, in which the optotype plate 1, which is a rectangular movable member, is rolled around rollers 2.3 located at both ends to prevent it from rolling. It is said that it can be moved left and right. The optotype plate 1 includes left eye optotype marks 4a to 4f made of, for example, a Landolt ring, for testing the visual acuity of the left eye, and similar right eye optotype marks 4m to 4f for testing the visual acuity of the right eye. 4r is provided. Further, near the bottom of each optotype mark 4, light transmitting portions 5a to 5f and 5m to 5r, which are dotted through holes that transmit illumination light, are provided. And the light transmitting parts 5a to 5f, 5m to
There is an LED (light emitter) behind the 5r.
instruction light sources 6a to 6f and 6m consisting of
~6r is provided for each optotype mark 4.

Here, if the rollers 2.3 are rotated in the same direction, the part with the optotype mark 4 can be selectively presented to the left eye, the right eye, or both eyes, and in the state shown in FIG. Visual target marks 4 are presented to both eyes.

FIG. 3 is a configuration diagram of an electric control circuit that controls the optotype section, and 11 is a single-chip microcomputer in which ROM-RAM, etc., in which the input/output board 9 control program is written, are integrated into one chip. . This microcomputer 11 has a joystick 12 for inputting responses.
, a motor 13 that rotationally drives the roller 2.3, and an optotype plate 1.
an illumination light source 14 for illuminating the optotype from the front and turning it off to remove it from view while the optotype plate l is moving; an instruction light source 6a to 6f, 6m to 6r for identifying the optotype mark 4; and printing of measurement results. A printer 15 and a power source 16 are connected.

FIG. 4 is a perspective view of the entire automatic visual acuity meter. Two observation windows, that is, a left eye window 2OL and a right eye window 2OR, are provided in the upper part of the automatic visual acuity meter corresponding to the optotype plate 1. Board l and window 2o
A light shielding plate 21 is arranged in the middle between L and 20R, and partitions the left eye window 2OL and the right eye window 2OR into left and right sides.

The optotype plate l is illuminated from the front by a bright light source 14, and the indicator light sources 6a to 6f, 6m to 6r are illuminated in a preprogrammed order.
are lit one by one, and the target mark 4 to be recognized by the examinee is identified through the light transmitting part 5, and the examinee identifies which target mark 4
It is now possible to immediately know what to judge.

The subject responds to the direction of the break in the optotype mark 4 using a response input joystick 12, and the computer 11 built in the automatic visual acuity meter determines whether the response is correct or not, and visual acuity is determined. ing.

FIG. 5 is a block diagram of another embodiment, where 22a to
22c, 22m to 22r are optical fibers provided behind the optotype plate 1, and the ends of these optical fibers are provided with instruction light sources 6a to 6C16m to 60, respectively, and the other ends are provided with light sources 6a to 6C16m to 60. It faces the transparent section 5. In reality, the number of optical fibers 22 and instruction light sources 6 is not three each, but
As shown in FIG. 1, many more are arranged.

FIG. 6 is a perspective view of another embodiment, in which the optotype plate 1 is detachably separated into a left optotype plate IL, a right optotype plate IR, and a central optotype plate 1C. is left eye optotype mark 4a~
4f and its vicinity are provided with light transmitting portions 5a to 5f, and the optotype plate IR is provided with right eye optotype marks 4m to 4r and light transmitting portions 5m to 5 in their vicinity. Furthermore, the central optotype plate 1C-1- is provided with a binocular frame mark 4 and a light transmitting portion 5 (not shown), and the left optotype plate IL and the right optotype plate I
These shafts 23.2 are attached to the shafts 23 and 24 that support R.
Rotary solenoids 25 for rotating each of the 4
．． 26 is attached.

If you operate the rotorinoid 25.26 here,
The optotype plates IL, IR are rotated together with the shafts 23, 24 so that portions of the optotype mark 4 can be selectively presented to the left eye, the right eye, or both eyes; in FIG. A mark is displayed.

FIG. 7 is a diagram of a diagonal sum of still another embodiment, and the axis 23.2
In the illustrated example, shielding plates 27 and 28 are numbered 1, and in the example shown, left eye optotype marks 4a to 4f and light transmitting parts 5a to 5 are provided.
f is presented.

If the rotary linenoid 25.26 is activated, the shaft 23
．． The shielding plates 27 and 28 rotate together with 24, and the optotype mark 4
The parts marked with are shown in Figure 6.

Similar to the embodiment shown, it can be selectively presented to the left eye, right eye, or both eyes.

[Effects of the Invention] As explained above, the automatic visual acuity meter of the present invention measures visual acuity by simultaneously presenting a large number of optotype marks,
Highly reliable visual acuity measurement can be performed.

[Brief explanation of drawings]

The drawings show an embodiment of the automatic visual acuity meter according to the present invention, in which Fig. 1 is a front view of the optotype section, Fig. 2 is a sectional view, Fig. 3 is a control circuit diagram, and Fig. 4 is a perspective view of the whole. FIG. 5 is a block diagram of another embodiment, and FIGS. 6 and 7 are perspective views of still further embodiments. 1 is an optotype plate, 2.3 is a roller, 4 is an optotype mark, 5
1 is a light transmission section, 6 is an instruction light source, 11 is a microcomputer, 12 is a joystick for response input, 13 is a motor, 14 is an illumination light source, 15 is a printer, 16 is a power source, 2
1 is a light shielding plate, 22 is an optical fiber, 23.24 is a shaft, 25
．． 26 is a rotorinoid, 27.28 is a shielding plate, and the patent applicant Canon Co., Ltd. Figure 6 Figure 4 Figure 5 bm-b.・7゜

Claims (1)

[Scope of Claims] 1. A reflective visual acuity chart board that displays a plurality of optotype marks of different sizes and has a light transmitting section provided near each optotype mark; The apparatus includes an illumination light source that illuminates from the front, an instruction light source that is arranged behind the light transmitting section at each of the optotype marks, and a control section that individually turns on the instruction light sources to identify the optotype mark. An automatic visual acuity meter that is characterized by: 2. The optotype plate is composed of a movable member wrapped around two rollers, and by rotating the rollers, the optotype mark is selectively presented to the left eye, the right eye, or both eyes. An automatic visual acuity meter according to claim 1. 3. A plurality of optotype plates are provided in which the optotype mark is present within the field of view of the left eye, the right eye, or both eyes, and by switching these optotype plates, the optotype mark can be placed in the left eye, the left eye, or both eyes. The automatic visual acuity meter according to claim 1, wherein the automatic visual acuity meter is adapted to be selectively presented to the right eye or both eyes. 4. The optotype mark exists within the field of view of the left eye and the right eye, respectively, and by moving the shielding plate that blocks the optotype mark, the optotype mark can be placed in the left eye, the right eye, or both eyes. The automatic visual acuity meter according to claim 1, wherein the automatic visual acuity meter is selectively displayed.