JPH0414572B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of automatic display using a plurality of optotype presentation conditions, that is, optotype presentation conditions that vary in optotype position, brightness, presentation time, presentation interval, etc. An automatic perimetry device that presents optotypes in a specific manner, and more specifically, by presenting optotypes in a high density in a specific area at the initial stage of optotype presentation, it is possible to detect specific diseases without having to present all optotypes. This invention relates to an automatic visual field measurement device that enables diagnosis.

[Conventional technology]

As an example of a conventional automatic perimetry device, one is known in which one optotype presentation program is composed of 50 to 200 optotype presentations, and the optotype presentation cannot be interrupted in the middle of this program. This optotype presentation is performed randomly based on the output of the random number generator, thereby eliminating measurement inaccuracies due to predictions of the subject's presentation.

As another example of a conventional automatic perimetry device, one is known that can stop visual target presentation in the middle of one perimetry program, but cannot output measurement data up to the time of stopping. .

In conventional automatic perimetry devices, a group of optotypes to be presented is specified by selecting a measurement program, but the order in which the optotypes are presented is determined by eliminating the predictability of the subject and ensuring accurate measurement. In order to perform this, it is not determined in advance and is determined by generating random numbers. Therefore, measurement data that is still being measured is considered to be unusable and is treated as described above.

[Problems to be solved by the invention]

It is preferable to complete the visual field measurement in as short a time as possible since it causes excessive fatigue to the person being measured. However, with conventional automatic perimetry devices, even if an abnormality becomes apparent during measurement and the measurement should be stopped, the measurement program must be continued to the end, resulting in excessive perimetry measurement. A problem has arisen in that this must be imposed on the person to be measured.

The present invention has been made in view of the above-mentioned conventional problems.The present invention presents optotypes at a coarse density in areas other than the above-mentioned specific areas, thereby efficiently measuring optotypes for discovering and diagnosing specific diseases. The purpose of the present invention is to provide an automatic perimetry device that can perform perimetry.

The present invention furthermore presents optotypes in areas other than the above-mentioned specific areas, thereby making it possible to present optotypes only in specific areas where visual field defects associated with specific diseases occur, thereby making it possible to predict the presentation of the subject. An object of the present invention is to provide an automatic visual field measuring device that can prevent inaccurate measurements.

[Means for solving problems]

The present invention has the following structural features in order to achieve the above object. That is, the present invention provides an optotype presentation means 1 having a plurality of optotypes, as shown in FIG.
and a presentation condition storage means 2 for storing at least one specific presentation step for presenting optotypes at a higher density in a specific area of the measurement visual field where an abnormality occurs more frequently than in other areas; an optotype presentation control means 3 which first reads out the stored specific step, then reads out other presentation steps to form an optotype presentation signal, and forms an optotype presentation interruption signal through an operator's operation; A response means 4 for the measurer to respond to the means presented by the optotype presentation means 3, and a response of the subject inputted by the response means 4 to correspond to the optotype presentation conditions being presented. It is composed of a response storage means 5 for storing the responses of the person to be measured, and an output means 6 for outputting the responses of the subject stored by the response storage means 5.

Further, in an embodiment of the present invention, the specific region of the specific presentation step includes at least one of a so-called Bjelm region with a collimation angle of 10° to 20° and a Nazal step region.

Furthermore, in another embodiment of the present invention, the optotype presentation control means includes a random number generator, and the optotype presentation for each step is configured to be performed randomly over the entire measurement field of view.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. The automatic perimetry device, as shown in Figure 2,
Housing 10, circular hole 12 for inserting the face of the person to be measured
An eye fixation unit 22 comprising a panel 14 attached to the front side of the housing 10, a recognition step 16, a forehead rest 18 and a chin rest 20 attached to the housing 10 to fix the eye to be inspected in a predetermined position. , and an operation display device 26 attached to the side wall 24 of the housing 10. A lower side wall near the front of the panel 14 has a handle 28 for moving the eye fixation unit 22 to be measured vertically and horizontally. Inside the housing 10 is a hemispherical dome 30 with a large number of LEDs 29 arranged over the entire inner surface for presenting visual targets.

The operation display device 26 includes a TV monitor 32 and a light pen 34, a printer 36 located below the TV monitor 32, a control switch 38 located above the TV monitor, and a fixed vision monitoring telescope 4.
Consists of 0. Hemispherical dome 30 is on the TV monitor 32
The type and distribution of the optotypes presented, as well as a plurality of operation commands to be described later, are displayed on the inner surface of the screen, and the apparatus is operated by selecting an operation command using the light pen 34 and the control switch 38.

Printer 36 prints the measurement results. In the fixation monitoring telescope 40, the eye to be measured is the hemispherical dome 3.
This system monitors from the front whether or not the person is gazing at a fixation target (not shown) placed at the center of the spherical surface of 0, and the object being measured is monitored through an aperture located at substantially the same position as the fixation target. Monitor the anterior segment of the eye.

Next, the configuration of this embodiment will be explained based on FIG. 3. The I/O interface 100 includes a light pen 34 operated by the measurer, an output signal from the control switch 38, and a recognition step 16 for inputting information as to whether or not the person to be measured has recognized the visual target.
, and converts the input signal into a signal suitable for processing by internal equipment and converts the measurement result into a signal suitable for printing on a printer 36. Here, the person being measured himself switches the cognitive switch 1.
6 is described, however, the measurer may receive the recognition from the subject and input it using a light pen.

The CPU 102 performs the main control of this device, and in addition to the contents explained later in the flowchart,
Performs various timing controls.

The LED matrix interface 103 is
This is an interface for lighting the corresponding LED 29 under predetermined conditions according to the optotype presentation conditions read out by the CPU 102, and constitutes an matrix with at least two transistor arrays.

The presentation condition storage unit 104 stores the LED of the dome 30.
The optotype presentation conditions that determine how to light up the visual field 29, ie, combinations of lighting brightness (intensity), position, lighting time, etc., are stored as a plurality of visual field measurement programs.

The glaucoma test program, which is one of the visual field measurement programs stored in the presentation condition storage unit 104, includes a first step of presenting an optotype 200 indicated by a black circle, as shown in FIG. 4 for the left eye test. ,
The second step consists of presenting an optotype 202 indicated by a white circle. The optotype 200 of the first step is distributed over the entire measurement field of view, and is located from the symmetrical position of the blind spot with respect to the so-called Bjelm area and the fixation point, which are sandwiched by circles 204 and 206 indicating collimation angles of 10° and 20°. The visual target 200 has a distribution density of an area extending outward (hereinafter referred to as "neural step area") other than that.
distribution density. This structure of the optotype distribution density is based on the fact that visual field defects due to glaucoma tend to occur in the Bjelm region and the Nazal step region, and in general, glaucoma can be detected and diagnosed by measuring the visual field only in these regions.

The optotype 202 of the second step is obtained by removing the optotype 200 of the first step from the general visual field measurement optotype distribution, and includes both the optotype presentation of the first step and the second step. This enables normal visual field measurement for the entire visual field.

In order to eliminate measurement inaccuracies due to predictions of the test subject's presentation, the optotypes are presented randomly at each step using a random number signal from a random number generator (not shown). Further, although FIG. 4 shows the optotype distribution for the left eye test, the optotype distribution for the right eye test is the one shown in FIG. 4, which is horizontally reversed.

A 12DC (graphic display controller) 110 receives the LED array signal, the selected measurement program signal, the signal indicating the position of the lit LED, and the above response signal, and displays information on these signals on the TV monitor 32. It forms an image signal for displaying and outputs it to the video memory 112.

Timing control circuit 114 is clock oscillator 1
A suitable timing signal is formed from the clock signal output from GDC 110 and 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 32.

Next, the operation of the CPU 102 will be explained based on the flowchart shown in FIG. First, TV
A predetermined program is selected from the measurement programs displayed on the monitor 32 using the light pen 34, and in the following it is assumed that the glaucoma program has been selected. Next, the visual target presentation conditions of the first step are read from the presentation condition storage section 104, and the LEDs 29 arranged on the inner surface of the hemispherical dome 30 are sequentially turned on via the LED matrix interface 103 to perform visual target presentation.

On the other hand, the response of the subject to the presentation of the optotype is input through the recognition step 16 and stored. Further, the measurer inputs a command to output the measurement results to the TV monitor using the light pen 34 while observing the presentation of the optotype and the response status of the person to be measured. That is,
At any time during the presentation of the optotype, the measurer can input an output command to stop the presentation of the optotype when he or she determines that the optotype is sufficient for diagnosing glaucoma. If this output command signal is not input,
Subsequently, it is determined whether or not the first step of displaying the optotype has been completed. If the presentation of the optotype in the first step has been completed, it is then determined whether or not the presentation of the optotype in the second step has been completed, and if it has been completed, the measurement results are output and all It is determined whether or not the measurement procedure has been completed, and all measurements by the program are completed.

In determining whether or not the output command signal has been input, if the output command signal is input, the output is formed based on the measurement results from the previous measurements, and the step of determining whether all measurements have been performed. Proceed to.

If it is determined that the first step has not been completed in determining whether or not the optotype presentation in the first step has been completed, the process proceeds to the step of reading out the optotype presentation conditions in the first step and continues. The first step of visual target presentation is then performed.

If it is determined that the second step has not been completed in determining whether or not the second step optotype presentation has been completed, the second step optotype presentation conditions are read from the presentation condition storage unit 104, and As in the 1st step, the LEDs 29 are sequentially turned on to present visual targets. The subject's response to the presentation of the visual target in the second step is input via the recognition switch 16 and proceeds to the stage of memorizing the subject's response.

Furthermore, if it is determined that all measurements have not been completed, the process proceeds to the step of determining whether or not the output command signal is input.

〔Effect of the invention〕

As described above, in the initial stage of measurement, the present invention mainly presents optotypes for the visual field part that is effective for discovering and diagnosing the disease in consideration of the specific disease and the characteristics of the visual field defect based thereon. The present invention is configured so that presentation of the optotype can be stopped at the time of , and has the effect that a predetermined disease can be discovered and diagnosed by presenting the optotype as few times as possible.

In addition, the above-mentioned optotype presentation is achieved by adding optotypes in a specific visual field to optotypes with coarse distribution density in other visual fields and presenting these randomly, eliminating predictions of the subject's presentation and improving accuracy. This has the effect of making it possible to measure a high visual field.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of the present invention, Fig. 2 is a perspective view of an automatic visual field measuring device according to an embodiment of the present invention, Fig. 3 is a block diagram of an electric circuit according to the embodiment, and Fig. 4 is a visual indicator presentation. Figure 5 is an explanatory diagram of the visual target distribution of steps.
This is a flowchart showing the operation of the CPU. 10...Housing, 16...Cognition switch,
26...Operation display device, 29...LED, 30...
... Hemisphere dome, 32 ... TV monitor, 36 ... Printer, 38 ... Control switch, 100
...I/O interface, 102 ...CPU,
103...LED matrix, 104...Presentation condition storage section, 108...Response storage section.

Claims (1)

[Scope of Claims] 1. An optotype presentation means having a plurality of optotypes, and at least one specific presentation step for presenting optotypes at a higher density in a specific region of the measurement visual field where abnormalities occur more frequently than in other regions. the specific presentation step stored in the presentation condition storage means is first read out, and then the other presentation steps are read out to form an optotype presentation signal, and the visual target presentation signal is formed by the operator's operation; an optotype presentation control means for forming a display interruption signal; a response means for the subject to respond to the optotype presented by the optotype presentation means; and a response device for the subject to be input by the response means and an output means for outputting the response of the subject stored by the response storage means. Automatic perimetry device. 2. The automatic perimetry device according to claim 1, wherein the specific area of the specific step includes at least one of a so-called Bjelm area with a collimation angle of 10° to 20° and a Nazal step area. 3. The visual field presentation control means includes a random number generator, and the visual field presentation is performed randomly over the entire measurement visual field at each visual target step based on the output of the random number generator. automatic perimetry device.