JPS60179034A - Automatic visual field measuring 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 [Industrial Field of Application] The present invention has a plurality of optotype presentation steps, that is, a visual field measurement method that fully automatically presents a plurality of optotypes with different sizes, brightness, and positions. The present invention relates to an automatic perimetry device, and particularly to an automatic perimetry device that can accurately measure visual fields even if presentation of optotypes is interrupted during perimetry.

[Prior art]

Generally, a perimeter meter is equipped with a screen on the inner surface of a hemisphere, and the eye to be measured is positioned at the center of the hemisphere.
This is done by gazing at the isotropy target placed in the center of the screen and pointing it at various places on the screen.

By the way, conventionally, data on the presentation conditions of the optotype, that is, the size, brightness, and position of the optotype, are stored in a memory circuit prior to measurement, and a predetermined program is executed according to this stored data to sequentially present the optotype. An automatic perimetry device has been proposed that reduces the operating burden on the examiner by performing the following steps.

However, visual field measurement covers a wide range from the center of the visual field to the peripheral part of the visual field of the subject's eye, and measures whether the examiner can recognize measurement points ranging from 700 points to 20θ points, for example, and the p11 fixed time is long. Usually it takes time. Therefore, it is difficult for the subject's eye to gaze at the fixation target during measurement, and a situation often arises in which the measurement must be interrupted. In this case, in the conventional device described above, presentation of the optotype can be arbitrarily interrupted.

However, when the optotype presentation is started again, the optotype presentation continues, and there is a problem in that the measurement results include values measured in a situation where the same optotype is not gazed, resulting in low reliability.

[Purpose of the invention]

The present invention was developed in view of the above-mentioned problems with the conventional automatic perimetry device when the measurement is interrupted. It is an object of the present invention to provide an automatic visual field measuring device that performs visual field measurement consisting only of accurate measured values by excluding the measured values from the measured values.

[Structure of the invention]

FIG. 1 is an overall configuration diagram showing the configuration of the present invention.

That is, the present invention comprises: an optotype presentation means 1 for presenting an optotype to a subject for visual field measurement; a presentation condition storage means 2 for storing optotype presentation conditions in a plurality of steps; and the presentation condition storage means 2. an optotype presentation control means 3 that sequentially supplies an optotype presentation control signal to the optotype presentation means 1 to control the optotype presentation means 1 based on the optotype presentation conditions stored in the optotype presentation condition; a response means 4 for responding to the optotype presented by the presentation means; and a response storage means 5 for storing the response of the subject inputted through the response means in correspondence with the optotype presentation condition being presented. , an output means 6 for outputting the response of the subject stored in the response storage means, and an optotype presentation stop signal supplied to the optotype presentation control means 3 by the examiner's operation, and the optotype presentation control means 3 for displaying the optotype. The optotype presentation control means 3 has a signal output means 7 that supplies a restart signal to the optotype presentation control means 3 and the response storage means 5, and further supplies an output control signal to the output means 6; When the optotype presentation stop signal is supplied from the signal output means, the formation of the optotype presentation control signal is stopped, and when the optotype presentation restart signal is then supplied from the signal output means 7, the control step is stopped. When the response storage means 5 is supplied with the optotype presentation restart signal, the response storage means 5 causes the optotype presentation means to execute the return by a predetermined number of steps in response to the return step. The test subject's response to the given visual target is separated from other responses, and the test subject's response corresponding to the return step is not outputted from the output means 6.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 2, the automatic visual field measuring device includes a housing 1G, a panel 141 provided with a circular hole 12 for inserting the subject's face and attached to the front side of the housing 10, a visibility switch 15, and a panel 141 for placing the subject's eye in a predetermined position. housing 1 to fix it on
0 attached to the forehead rest 16 and chin rest 18, and the operation display device 22 attached to the side wall 20 of the housing 10.
Consisting of

On the lower side wall near the front of the panel 14 is a hand grip 2 for moving the forehead rest 16 and the chin rest 18 vertically and horizontally.
It has 4. Inside the housing 10 is a hemispherical dome 23 in which a large number of LEDs are arranged over the entire inner surface to present visual targets.
is built in, and the eye to be examined is positioned at the center of the hemispherical dome 23.

The operation display device 22 includes a TV monitor 30 and a light monitor 3.
2. Printer 31 placed below the TV monitor 30;
It consists of a control switch 34 and a fixation monitoring telescope 36 arranged above the TV monitor 30. The TV monitor 30 displays the type of optotype and the optotype distribution presented on the inner surface of the hemispherical dome 23, as well as a plurality of operation commands to be described later, and the device is operated by selecting an operation command using the light bezel 32 and the control switch 34. do.

The printer 31 prints the measurement results. The fixation monitoring telescope 36 monitors from the front whether or not the subject's eye is gazing at a fixation target placed at the center of the spherical surface of the hemispherical dome 23. The anterior segment of the eye being measured is monitored through the entire hole. The visual recognition switch 15 is operated by the subject during measurement to output an ON=OFF signal indicating whether or not the visual target can be visually recognized.

The operating instructions for this device are as follows.

(1) Selection of a measurement program, for example, a screening program that measures the entire field of view in a screening manner, a meridional program that measures in the radial direction, etc.
It is selected by the light ben 32 before starting measurement.

C2) Selection of the brightness and intensity of the presented optotype. 1. Selected by lightben 32.

(,3) Selection of the lighting time of the visual target to be presented. Selected by lightben 32.

佼) Selection of the time interval from one presentation of the presentation target to the next presentation. Selected by lightben 32.

0) Start of measurement program. Although it is operated by the light ben 32, it is also operated by the control switch 34 before starting measurement.

(I)) Interruption of measurement program. It is also operated by the light ben 32, but during measurement the control switch 34
operated by.

(7) Restoration of measurement program. It is also operated by the light ben 32, but during measurement interruption, the control switch 3
It is also operated by 4.

Prompt) Output the measurement results from a printer, etc. light ben 32
operated by.

Next, the configuration of this embodiment will be explained based on FIG. 3.

/10 Inter 7 Eighth 10G includes output signals from the light ben 32 and control switch 34 operated by the examiner, and an output signal from the visibility switch 15 operated by the examinee to indicate whether or not the visual target has been visually recognized. is input, and converts the input signal into a signal that can be easily processed by the internal device, and converts the measurement result into a ratio signal suitable for printing on the printer 32.

The CPLJ 102 performs main control of the device, the details of which will be explained later with reference to a flowchart. The LED matrix interface 104 is an interface for lighting up the target LED under predetermined conditions according to the optotype presentation conditions sequentially read out by the CPU 02.
The LED matrix is composed of two transistor arrays. The presentation condition storage means 106 stores a plurality of combinations of optotype presentation conditions that determine how the LEDs of the dome 23 are to be lit (i.e., brightness and intensity of lighting), positions, and lighting times. The response storage means 108 stores the response signal input via the visual recognition switch 15 of the subject.
It is stored in association with the optotype presentation conditions at that time. In this way, data regarding the subject's visibility is obtained.

GDC (graphic display controller) 11
0 receives the LED array signal, the selected measurement program signal, the signal indicating the position of the lit LED, and the above response signal to form an image signal that displays information on these signals on the TV monitor 30. and put this in video memory 11
Output to 2. The timing control circuit 114 forms an appropriate timing signal from the clock signal output from the clock oscillator 116 and outputs a timing signal to the GDCI 10 and the CPU 102.
and output to the video memory 112.

The P/S converter 118 performs parallel-to-serial conversion on the parallel digital signal from the video memory 112 to form a video signal, and outputs the video signal to the TV monitor 30.

Next, the functions of this embodiment will be explained based on the flowchart shown in FIG. First, the subject selects the measurement program with the light pen, and then the CPLI
102 generates an optotype presentation condition from the presentation condition storage means 106, and in accordance with this, the LED e of the dome 23 is lit under a predetermined condition via the LED matrix interface 104 to present the optotype.

Next, a signal indicating whether or not the subject visually recognized the presented optotype is output by turning on/off the visual recognition switch 15, and this signal is stored in the response storage means.

Subsequently, the cpuioo switches the light pen 32 or the control switch 3 when the examiner determines that it is undesirable to continue the measurement because the examinee's eye is no longer gazing at the fixation target.
4, the optotype presentation stop signal is input and it is fully determined whether it is a friend or not. If there is an input, the process proceeds to the input determination of the optotype presentation stop signal, and if there is no input, the process proceeds to the measurement end determination. In the measurement end determination, it is determined that the measurement is complete. If not, set the optotype presentation condition step/step, for example, set the LEDilsb LE to light up.
There is no measurement progress such as changing to D, and the optotype is presented again according to the conditions. The progress of this optotype presentation condition step is repeated until the optotype presentation stop signal is input or the presentation under the selected optotype presentation condition is completed.

When the optotype presentation stop signal is input to the CPU 102 via the /10 interface 1()0, the CPU 102
stops reading out the optotype presentation conditions, and thereby the LE
Visual target presentation by the D matrix interface 104 is stopped.

After the optotype presentation is stopped, a determination is made to input a measurement stop signal indicating whether or not to stop the visual field measurement midway. Here, when a measurement stop signal is inputted by the examiner's operation, the process proceeds to a determination of input of an output command signal. If the measurement stop signal has not been input, the process advances to a determination of whether the optotype presentation restart signal is input. Here, if the optotype presentation restart signal is not input, the process goes back to the input determination of the measurement stop signal. After that, the examiner's light pen 32
Or, by operating the control switch 34, the optotype presentation restart signal is sent to C, P via the /10 interface 7/8 100.
When input to U 102, the CPU 102 deletes, for example, the latest two steps of response signals from among the response signals stored in the response storage means 108.

Further, the CPLI 102 reverts the visual target presentation condition by a step corresponding to the deletion of the response signal, and then restarts the visual target presentation according to the predetermined visual target presentation condition.

When the measurement stop signal is input after the measurement by the selected measurement program is completed or the optotype presentation has completely stopped, the CP
U102 determines whether or not an output command signal is inputted by the examiner's operation, and if this output command signal is inputted, a measurement signal is outputted by the P/S converter 30 and then outputted to the TV monitor 30. Alternatively, the measurement result is displayed by outputting it to the printer 31. On the other hand, if the signal is not input, no output is formed and the operation ends.

In this embodiment, a spherical perimeter using a plurality of LEDs as optotypes has been described, but the present invention is not limited to this, and may also be applied to a projection type perimeter or a flat perimeter. This can also be applied to.

〔Effect of the invention〕

As explained above, in the present invention, when measurement is interrupted due to the subject's eye no longer gazing at the fixation target, etc., the latest 7
Alternatively, measurement is started after deleting a plurality of measurement data and restoring measurement steps corresponding to the deleted measurement steps, which has the effect of making it possible to perform visual field measurement based only on highly reliable measurement values. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of the present invention, Fig. 2 is a perspective view of a visual field measuring device according to an embodiment of the present invention, Fig. 3 is the same (configuration block diagram of the embodiment), and Fig. FIG. 3 is a flowchart diagram showing the operation. 1 Visual target presentation means 2 Presentation condition storage means 3 Visual target presentation control means 4 Response means 5 Response storage means 6 Output means 7 Signal output means 10 Housing 15 Visual recognition switch 22 Operation display device 3 GTV monitor 32 Light pen 36 Fixation monitoring telescope

Claims (1)

[Claims] (1) An optotype presenting means for presenting an optotype to a subject for visual field measurement, a presentation condition storage means for storing optotype presentation conditions in a plurality of steps, and an optotype stored in the presentation storage means. optotype presentation control means that sequentially supplies an optotype presentation control signal to control the optotype presentation means based on presentation conditions; a response means for storing a response of a subject inputted through the response means in correspondence with the visual target presentation condition being presented; an output means for outputting a response from an examiner; and an output means for outputting an optotype presentation stop signal to the optotype presentation control means through an operation by the examiner, and supplying an optotype presentation restart signal to the optotype presentation control means and the response storage means. and signal output means for supplying an output control signal to the output means, and the optotype presentation control means controls the optotype presentation when the optotype presentation stop signal is supplied from the signal output means. The generation of the signal is stopped, and then when the optotype presentation restart signal is supplied from the signal output means, the control steps are returned and executed by a predetermined number of steps, and the response storage means is configured to output the optotype presentation restart signal. When the optotype presentation restart signal is fully supplied, the response of the subject to the optotype presented by the optotype presenting means is separated from other responses in accordance with the return step, and the response corresponding to the return step is An automatic visual field measuring device characterized in that the test subject's response is configured so that the response of the subject is not output from the output means. 0) The automatic visual field measuring device according to claim 1, wherein the signal output means outputs the optotype presentation stop signal and the output control signal according to an operator's operation.