JPH066107B2 - Visual function inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a visual function inspection device, and more particularly, to presenting an optotype for optotypes for visual function inspection for inspecting a plurality of visual functions in a predetermined housing. The optotype switching of the optotype presenting unit, the signal selected by the presentation optotype selecting unit arranged apart from the optotype presenting unit is converted into a wireless communication signal, and the optotype presenting unit is provided with the optotype presenting unit. The present invention relates to a visual function inspection device performed by transmitting.

[Prior Art] In a conventional device called a visual acuity chart, an optotype presenting section (also referred to as a visual acuity chart) having an optotype for visual function inspection is arranged at a position several meters in front of a subject. The format is generally used.

The simplest method of controlling the optotype selection of the optotype presenting unit by this type of device is to control the optotype presenting unit by a control box connected to the optotype presenting unit. However, this method has inconveniences such as the possibility of wire breakage due to hooking and restrictions on movement.

Therefore, recently, an apparatus has been proposed in which a control box has a transmitting means built-in and a visual target presenting section has a receiving means built-in. For example, it is a method of using light, ultrasonic waves, electromagnetic waves, etc. for transmission / reception.

[Problems to be Solved by the Present Invention] However, according to the method of the above-mentioned conventional technique, when the operation of the optotype presenting unit is controlled by the control box separated from the optotype presenting unit, the signal transmitted from the control box is Due to a temporary obstacle from the outside, the optotype presenting part may not be reached and the optotype screen may not be switched. That is, when light or ultrasonic waves are used for transmission / reception, light may be temporarily blocked by the movement of a person. Also, when electromagnetic waves are used, they may be temporarily affected by electromagnetic waves from other devices.

When there is such a temporary failure, the target screen data on the control box side and the actual target screen do not match.

If the examiner continues to carry out the examination without noticing this, there will be a discrepancy between the data on the device and the true examination result.

In addition, when the operator tried to switch the screen from the visual acuity test target to the astigmatic test target by operating the control box, but the target presentation unit did not work, it was not useful for the subject. It will cause confusion.

Therefore, a first object of the present invention is to provide a visual function inspection device in which the optotype screen data on the control box side and the actual optotype screen are surely matched.

Moreover, since the conventional wireless communication between the optotype presenting unit and the control box is one-way, complicated control cannot be performed. For example, a large number of switches are required to place a plurality of optotypes on the same screen and specify the optotypes to be presented to the subject by one-way communication, and it is possible to avoid increasing the size of the device. Absent.

Therefore, a second object of the present invention is to provide a visual function inspection device capable of performing complicated control between the optotype presenting section and the control box.

[Means for Solving the Problems] In order to achieve the above object, the present invention has an optotype presenting unit that switches and displays optotypes for visual function inspection for inspecting a plurality of visual functions in a predetermined housing, The optotype switching of the optotype presenting unit is performed by converting a signal selected by a presentation optotype selecting unit arranged apart from the optotype presenting unit into a wireless communication signal and transmitting the radio communication signal to the optotype presenting unit. In visual function inspection device,
Response signal transmitting means connected to the visual target presenting section, which responds when a signal from the presenting visual target selecting means is received, and the present visual target selecting means by receiving a signal from the response signal transmitting means And a signal receiving means for transmitting a signal to the.

Further, the response signal of the presented visual target selecting means is characterized by adding the information held by the presented visual target selecting means to the signal transmitted by the presented visual target selecting means.

The information to be added by the presented visual target selecting means is characterized by being information for individualizing a plurality of visual targets in the screen.

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

The apparatus of the present embodiment includes an optotype presenting section (visual acuity table) and an optotype (screen).
In addition to communication with the switching control unit, communication with the subjective optometer is possible.

FIG. 1 is an external view of an optotype presenting section (visual acuity table) for switching and displaying optotypes for visual function inspection, which is an embodiment of the present invention.

At the center of the housing 1, there is a film 2 which is illuminated by a film illumination lamp 8 from the back side, and a visual target for visual function inspection is printed or attached to the film 2. FIG. 1 shows a state in which the film 2 is positioned so that the optotype 3 for inspecting the visual acuity values of 0.2, 0.3, and 0.4 is arranged in the central portion of the housing 1. 4 is a lamp arranged next to the optotype column for each visual acuity value, for distinguishing a plurality of optotype columns when presented on the same screen, and for converting into an electric signal, For more details, the applicant's patent “Visual acuity test device” dated November 21, 1986
It has been described in.

Reference numeral 5 denotes an infrared light receiving / emitting window for receiving and transmitting an infrared signal for remote operation.

FIG. 2 shows a sectional view of the embodiment of FIG.
The film 2 is wound between the drum 6 and the drum 7, and the screen is switched by rotating the drum 6 and the drum 7 with a motor 9 and a gear and a belt (not shown). Reference numeral 10 denotes a photoelectric switch for film initial position detection arranged on the left side of the screen, and on the right side of the screen is a photoelectric switch 11 for detecting screen changeover having the same shape. Reference numeral 8 is a lamp for illuminating the film from the back side, which is turned on by a relay.

FIG. 3 is an external view of an optotype switching control unit 12 that selects an optotype to be presented to the subject, and an subjective optometer control unit 13 that selects an optical element placed in front of the eye to be examined. It is formed integrally.

Reference numeral 14 is an optotype selection switch, and a code signal corresponding to each optotype selection switch is transmitted to the visual acuity table 1.
Reference numeral 15 is one of the optotype selection switches, a stereoscopic vision test switch for selecting a stereoscopic vision inspecting target for inspecting the stereoscopic vision of the eye to be inspected, and 16 for inspecting simultaneous binocular vision It is a switch for testing four worth lights.

FIG. 4 is a block circuit diagram of the visual target switching control unit 12.

The optotype switching control unit 12 includes a reception unit 20 including a light receiving element 23, a preamplifier 22, and a detection circuit 21, a transmission unit 26 including a code modulation circuit 27, an output buffer 28, and a light emitting element 29, and an optotype selection switch. 14, CPU,
It is composed of a microcomputer unit 25 including a ROM and the like. Reference numeral 24 is a subjective optometer.

FIG. 5 is a block diagram of the optotype presenting unit (visual acuity table) 1 that operates according to a signal from the optotype switching control unit 12.

Reference numeral 45 is a receiving unit that receives a signal from the target switching control unit 12. Reference numeral 46 denotes an infrared light receiving element attached to the housing, which is converted into a digital signal by a preamplifier 47 and a detection circuit 48. Reference numeral 39 is a motor for driving the film 2, which is normally or reversely rotated by a microcomputer circuit 49 and a forward / reverse rotation relay 44. Reference numeral 40 denotes a transmission unit that receives a signal from the target switching control unit 12 and transmits a response signal, which includes a code modulation circuit 43 and an output buffer 4.
2. The light emitting element 41 is used to convert the response signal from a digital signal to an infrared signal. Reference numeral 50 is a relay for turning on the lamp 8 which illuminates the film 2 from the back side.

The operation of the embodiment having the above construction will be described below with reference to the flowchart of FIG.

When inspecting the stereoscopic vision of the subject, when the examiner presses the stereoscopic vision test switch 15 in the visual target selection switch 14 in order to select the visual target for the stereoscopic vision inspection (step 61), the microcomputer circuit A predetermined coded digital signal A is generated by 25, and is converted into a coded infrared light pulse signal by a transmission section 26 including a code modulation circuit 27, an output buffer 28, and a light emitting element 29, and a visual acuity chart ( It is transmitted to the optotype presenting unit) 1 (step 62).
In this embodiment, the same signal is repeatedly transmitted twice to ensure the transmission and reception of the signal (step 63). The infrared signal transmitted toward the visual acuity chart (target presenting section) 1 is taken into the visual acuity chart (target presenting section) 1 through the infrared light receiving / emitting window 5 to receive the light receiving element 46, the preamplifier 47, and the detection circuit 4.
8 is converted into a digital signal by the receiving unit 45 and input to the microcomputer 49 (step 8).
1, 82, 83, 84). Microcomputer circuit 4
The motor 9 rotates forward based on the signal from the drum 9,
Rotates counterclockwise, and the film 2 is wound downward. The film initial position detection photoelectric switch 10 and the screen switching detection photoelectric switch 11 detect a position detection symbol provided at the end of the film for each screen. The microcomputer 49 rotates in the forward and reverse directions at the time when the screen switch detection photoelectric switch 11 detects the position detection symbol indicating the position of the screen including the stereoscopic inspection target (not shown) configured by the polarizing plate. The relay 44 is controlled to stop the motor 9 (step 85). When the stereoscopic visual target is presented on the screen in this way, a response signal, which is the digital signal A ′ coded by the microcomputer 49, is sent to the transmission section 40, and the code modulation circuit 43, the output buffer 42, The infrared light pulse signal is converted into a coded infrared pulse signal by the light emitting element 41 and transmitted from the infrared light receiving / light emitting window 5 to the receiving unit 20 of the target switching control unit 12 (steps 86, 87).

In the present embodiment, the signal A emitted by the visual target switching control unit 12 is different from the signal A ′ emitted by the visual acuity table 1, but
The reason will be explained. The signal A in this embodiment is the film 2
It is only a signal for selectively arranging a specific one screen in the center of the housing 1. Therefore, when a plurality of optotypes are present on the same screen, the optotypes instructed by the subject to read and the data of the optotype switching control unit 12 do not necessarily match. For example, as described above, the visual target switching control unit 12 uses Landolt 0.2, 0.3, 0.
When the selection switch 17 for switching to the screen on which the three types of optotypes of 4 are arranged is pressed, only the signal from the selection switch causes
It is not possible to distinguish which optotype sequence the subject is instructed to read by the lamps 4 arranged next to each optotype sequence. As one method of making the three types of visual acuity values individual and matching the data of the visual target sequence instructed by the subject with the visual target switching control unit 12, the lighting data of the lamp 4 is used in this embodiment. It is realized by individualizing the transmission signal A ′ from the side of the visual acuity chart (optotype presenting section) 1 based on the above.

In this embodiment, as shown in the flow chart of FIG. 6, the screen to be presented has moved to a predetermined position so as to be able to cope with the case where the visual acuity table drive mechanism does not operate due to a failure. The photoelectric switch for screen switching detection 1
Although the response signal is sent after the confirmation with the signal of 1, the order of steps 86 and 87 may be changed.

After a lapse of a preset time t from step 63 in consideration of the time required for chart driving (step 69), the light receiving element 23, the preamplifier 22, and the detection circuit 21 receive the signal and convert it into a digital signal. Signal is
Processed by microcomputer (step 6)
4, 65, 66, 67), a predetermined signal is sent to the subjective optometer 24 via a communication cable, and the auxiliary lens of the subjective optometer is switched to a polarizing lens for stereoscopic inspection (step 68).

Similarly, for example, if the switch 4 for the watt four-light test for inspecting the simultaneous visual acuity of both eyes is pushed, the subjective optometer 24
The auxiliary lens of can be switched to a red filter for the right eye and a green filter for the left eye.

In this way, the optotype presenting unit (visual acuity table) and the optotype (screen)
Communication between the switching control unit and the subjective optometer can be realized.

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to realize a visual function inspection device in which the optotype screen data on the control box side and the actual optotype screen are surely matched.

Also, since the optotype presenting unit and the control box each have a communication function to the other, complicated control can be performed between them.
There is no need to upsize the device.

[Brief description of drawings]

FIG. 1 is an external view of a visual acuity table (optotype presenting section) according to an embodiment of the present invention, FIG. 2 is a sectional view of the example of FIG. 1, and FIG. 3 is an optotype switching control section 12 and a subjective type. FIG. 4 is an external view of the optometer control unit 13, FIG. 4 is a block circuit diagram of the optotype switching control unit, FIG. 5 is a block circuit diagram of the visual acuity table (optotype presenting unit), and FIG. 6 is an embodiment of the present invention. It is a flowchart figure which shows operation | movement. 1 …… Optical acuity chart (target presenting part) 5 …… Infrared light receiving / emitting window 12 …… Target switching control unit 13 …… Self-conscious optometer control unit 14 …… Target selection switch 25 …… Target switching control Microcomputer circuit 40 ... Transmitter 41 that transmits a response signal 41 ... Light emitting element 42 ... Output buffer 43 ... Code modulation circuit

Claims (3)

[Claims] 1. An optotype presenting section for switching and displaying optotypes for visual function inspection for inspecting a plurality of visual functions in a predetermined housing, and optotype switching of the optotype presenting section. In the visual function inspection device, which is performed by converting the signal selected by the presentation optotype selecting unit arranged apart from the radio communication signal and transmitting the signal to the optotype presenting unit, the signal from the presentation optotype selecting unit A response signal transmitting means connected to the optotype presenting section, which responds when the signal is received, and a signal receiving means for receiving a signal from the response signal transmitting means and transmitting the signal to the presented optotype selecting means. A visual function inspection device comprising: 2. A visual function test characterized in that the response signal of the presented visual target selecting means of claim 1 is obtained by adding information possessed by the presented visual target selecting means to a signal transmitted by the presented visual target selecting means. apparatus. 3. The visual function inspection device according to claim 2, wherein the additional information is information for individualizing a plurality of optotypes on the screen.