JPS63132629A - Sight examination apparatus - 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 Application of the Invention) The present invention relates to a visual acuity test device that simultaneously displays a plurality of visual acuity test targets having different visual acuity values on one screen.

(Prior Art) Visual acuity tests are generally performed through responses between an examiner and a subject. Therefore, it is desirable to have one chart per screen in order to ensure smooth response.

However, in addition to the need for visual acuity charts, astigmatism charts, stereoscopic vision charts, and other optotypes for testing many visual functions, it is also necessary to use different optotypes in consideration of the characteristics of the optotypes, such as language and age, even when testing the same function. Since visual targets are required, it is practically impossible to fit all of these on one screen due to economical and space constraints. Therefore, it is common to display several charts on one screen at the same time. Conventional visual acuity testing devices of this type test the subject while specifying the optotype to be read verbally or with an indicator stick, and in order to input the results into the subjective optometric test, etc. Normally, numerical values are entered using a keyboard. However, these devices are complicated to operate, and not only do input operations take time, but there is also a possibility that mistakes may occur. In addition, in order to test a large number of people, there is a problem in that it requires a lot of manpower, as the person who indicates the optotype, the person who inputs it, and the person who operates it, etc., have to be divided.

(Object of the Invention) The object of the present invention is to provide an apparatus that can clearly indicate to the subject the visual target to be read and extract the clearly indicated visual target value as a signal in order to ensure a smooth response. Our goal is to provide the following.

(Structure of the Invention) In order to achieve the above object, the present invention provides a visual acuity test device that simultaneously displays a plurality of visual acuity test visual targets having different visual acuity values on one screen. It is characterized by providing a means to clearly indicate the It also includes a means for specifying the optotype to be read by the subject, a means for switching to the next step of the visual acuity test, and a means for transmitting the visual acuity value information to another eye test device. The present invention is characterized in that the visual acuity value read by the subject immediately before switching to the visual acuity test is switched based on the signal from the optotype display means and is automatically transmitted to the eye test device.

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

FIG. 1 is an external view of one embodiment of the present invention. There is a film 2 in the center of the housing 1 that is illuminated from the back, and on the same screen there are visual targets 3-1, 3-2 with visual acuity of 0.2.0.3.0.4.
．． 3-3 is placed.

Reference numerals 4-1, 4-2, and 4-3 indicate lamps arranged beside the optotype rows for each visual acuity value. Since it is usually placed several meters in front of the subject, the infrared receiving window 5 is arranged so that it can be remotely controlled without a cord.

FIG. 2 shows a cross-sectional view of the embodiment shown in FIG.
A film 2 is wound between a drum 6 and a drum 7, and the screen is changed by rotating the drum 6 and drum 7 using a motor 8 and a gear and belt (not shown). 9 is a photoelectric switch for detecting the initial film position located on the left side of the screen, and on the right side of the screen is a photoelectric switch 11 (FIG. 4) for detecting screen switching, which has the same shape as the one, 10-1.10-
Reference numeral 2 denotes a lamp for illuminating the film 2 from the back side, and it is turned on by a relay 24 (FIG. 4).

FIG. 3 is an external view of the optotype switching control section 12,
Subjective ophthalmoscope control unit 1 connected to the subjective ophthalmoscope
3 is integrally formed.

14 is a display unit that displays measurement results. Reference numeral 15 denotes a group of 24 optotype changeover switches, which can switch between optotypes for visual acuity testing, refraction testing, and visual function testing. 16
17 is a visual acuity value display section.

FIG. 4 is a block circuit diagram of the visual acuity testing device.

The controller 17 is composed of CPU% RAM, ROM, etc., and inputs signals from the optotype switching control section 12, and plays the role of a functional core that controls each section. Reference numeral 19 denotes a transmitting light emitting section which converts the signal from the optotype switching control section 12 into infrared light and sends it to the optotype inspection apparatus main body. Reference numeral 20 denotes an infrared light receiving section attached to the housing 1, which is converted into a digital signal by a preamplifier 21 and a detection circuit 22. 23 is a relay for rotating the motor 8 in the forward or reverse direction.

The operation of the embodiment configured as above will be described next.

When the power is turned on, the motor 8 rotates forward, and the drum 7
rotates counterclockwise, the film 2 is wound downward, and when the film initial position detection photoelectric switch 9 detects the initial position of the film, the controller 18 controls the relay 23 and stops the motor 8. At this point, Figure 5-1 in Figure 5 is displayed on the screen, and the visual acuity value display section 1
0°05 is displayed at 7. Visual acuity value selector switch 1
When the upper arrow part of 6 is pressed, the motor 8 reverses and the drum 6 rotates clockwise, and the photoelectric switch 11 detects marks (not shown) provided on the film for each screen, and the screen changes to 5. - Switched to figure 2, visual status display lamp 4 -
1 lights up. At this time, 0.1 is displayed on the visual acuity value display section 17 in FIG. Similarly, by pressing the visual acuity value changeover switch 16, the screen, visual acuity condition display lamp, and visual acuity value display section are switched as shown in Fig. 5-3 -> Fig. 5-4 -> Fig. 5-5 -> Fig. 5-6. Furthermore, the visual acuity value (0, 5, 0, 6
,0,7) on one screen, (0,8,0,9,1,0) on one screen, and (1,2,1,5,2,0) on one screen. A total of 6 screens can display the 15 levels of visual acuity required for standard visual acuity tests.

The subject is asked to read the visual acuity test visual acuity mark in the row where the lamp is lit, and if the test subject can read it, further presses the up arrow switch of the visual acuity value changeover switch.

If the image cannot be read at this point, press the up arrow switch of the visual acuity value changeover switch to return the lamp to the illegible visual acuity value. The visual acuity value is determined by the above operations, and the determined visual acuity value is displayed on the visual acuity classification display section 17. Visual acuity values include unaided visual acuity, corrected visual acuity 9, right eye visual acuity, left eye visual acuity, and binocular visual acuity, but switches 23, 24.
25.26.27, and when the switch is pressed, all visual acuity values are automatically memorized by memorizing the visual acuity values that were displayed on the visual acuity value off display section until then. , and can be further printed using a printer (not shown).

According to this embodiment, the visual target to be read by the examinee is clearly indicated with a simple configuration and at low cost, and smooth responses between the examiner and the examinee are possible. Since it can be output as a signal, each visual acuity value can be easily displayed, printed, or input into a computer.

(Effects of the Invention) As is clear from the above description, according to the present invention, in order to identify a plurality of presented visual targets, unnecessary responses between the examiner and the subject can be avoided, and the visual acuity Previously, in order to display or print values, you had to enter them using a keyboard, etc., but now you can simply operate the visual acuity selection switch.
Since it is possible to switch and give instructions on the optotype to be read, and to output visual acuity value information as an electrical signal, it is possible to automatically send it to other eye examination devices.

[Brief explanation of the drawing]

FIG. 1 is an external view of an embodiment according to the present invention, FIG. 2 is a sectional view of the embodiment of FIG. 1, FIG. 3 is an external view of the optotype switching control unit 12, and FIG. 4 is an eye test A block circuit diagram of the device, FIG. 5 is an explanatory diagram for explaining the operation of the device of the embodiment.

Claims (3)

[Claims] (1) In a visual acuity test device that displays multiple visual acuity test optotypes with different visual acuity values on one screen at the same time, a means for specifying the optotype that the test subject should read and a signal indicating the specified optotype value. A visual acuity testing device characterized by being provided with a means for taking out the eye. (2) The visual acuity testing device according to claim 1, characterized in that display marks for each visual acuity value are arranged in the periphery of the optotype array of visual acuity values. (3) In a visual acuity testing device that simultaneously displays multiple visual acuity test optotypes with different visual acuity values on one screen, there is a means for clearly indicating the optotype that the test subject should read, and a means for clearly indicating the optotype value. It consists of a means for taking out the visual acuity test as a signal, a means for switching to the next step of the visual acuity test, and a means for transmitting the visual acuity value information to another eye test device. A visual acuity testing device characterized in that the visual acuity value read by the eye is switched based on a signal from the optotype clarifying means and is automatically transmitted to the eye testing device.