JPH043213B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic perimetry device, more specifically,
This invention relates to an automatic visual field measurement device that has improved fixation devices.

[Conventional technology]

Visual field measurement is performed by sequentially presenting visual targets under predetermined presentation conditions while causing the eye to be measured to fixate a specific visual target, that is, a fixation target placed at the center of the visual field. By the way, as a monitoring device for the fixation status of this fixation target,
Conventionally, prior to the configuration of a telescope system for observing the eye to be examined or the measurement of each eye to be measured, an optotype corresponding to the blind spot position, that is, an optotype for the blind spot position, is detected, and 50 to 200 optotypes are used for one measurement. The target presentation is divided into multiple groups, and the blind spot position target is presented at the end of each group's target presentation, and if the subject does not recognize this, it is determined that the subject is fixating on the fixation target. A system is known in which the next optotype is presented.

During this monitoring of the eye to be measured, if it was determined that the eye was not fixating on the fixation target, the data from the visual field measurement performed after the previous fixation monitoring was deleted as inaccurate. .

[Problem that the invention sought to solve]

By the way, the number and position of blind spot position visual targets presented for fixation monitoring in conventional automatic perimetry devices, that is, the blind spot position visual number distribution, is configured so that it cannot be changed after measurement has started. There may be cases where it is desired to change the number and position of blind spot position targets after the start. In other words, if the distribution of the blind spot position target is spread over the entire area of the blind spot, the fixation conditions are too strict and the measurement does not proceed as expected; conversely, if the fixation conditions are too lenient, the measurement becomes inaccurate. This is because the optimal blind spot position visual target distribution that takes into account measurement efficiency and measurement accuracy differs from person to person, and can only be known after actually performing visual field measurements to some extent.

[Means for solving problems]

In order to solve the above-mentioned problems of the conventional automatic perimetry device, the present invention is configured to be able to change the blind spot position optotype distribution after the start of measurement, but such changes can only be made to alleviate the fixation conditions. be. This is because even if the fixation conditions are made stricter during the measurement, the measurement data still includes measurement data under the original looser fixation conditions, so the overall measurement data is This is because it is appropriate to treat this as being due to the fixation conditions, and there is no benefit to making the fixation conditions stricter.

That is, the present invention provides an optotype presentation optotype 1 for presenting an optotype for visual field measurement, a presentation condition storage means 2 that stores a plurality of different optotype presentation conditions as a measurement program, and the presentation condition storage means 2 for storing a plurality of different optotype presentation conditions as a measurement program. an optotype presentation control means 3 for reading the optotype presentation conditions stored in the means 2 and controlling the optotype presentation means 1; a response storage means 5 for storing the response signal from the response means 4 as measurement data, and a blind spot position index storage means for storing a blind spot position index corresponding to the blind spot position of the eye to be measured. 6 and
a fixation monitoring target setting means 7 for selecting and measuring a fixation monitoring target used for fixation monitoring from the targets stored in the blind spot position target storage means 6; a setting optotype control means 8 for reducing the number of set optotypes of the monitoring optotype setting means 7; control to detect the blind spot position optotype, and control the fixation monitoring optotype setting means 7 every time a certain number of optotypes are presented during the control of the optotype presentation means 1 according to the above-mentioned optotype presentation conditions for individual monitoring. The above-mentioned problem is solved by configuring the system to present a visual target for use.

〔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-fixing unit 22 comprising a panel 14 attached to the front side of the housing 10, a recognition switch 16, a forehead rest 18 and a chin rest 20 attached to the housing 10 to fix the eye to be measured in a predetermined position. , and an operation display device 26 attached to the side wall 24 of the housing 10. Panel 14
A handle 28 is provided on the lower side wall near the front surface of the eye fixing unit 22 for moving the eye fixation unit 22 vertically and horizontally. Inside the housing 10, a hemispherical dome 30 with a large number of LEDs 29 arranged over the entire inner surface is built in to present 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 visually monitors from the front whether or not the patient is gazing at a fixation target (not shown) placed at the center of the spherical surface of 0, and is measured through an aperture located at substantially the same position as the fixation target. The anterior segment of the eye to be measured.

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 a control switch 38, and a recognition switch 16 for inputting information as to whether or not the subject 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 person to be measured and input it using a light pen.

The CPU 102 performs the main control of this device, and performs various timing controls in addition to the content that will be explained later using a flowchart.

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

The presentation condition storage unit 104 stores the LED of the dome 30.
Combinations of optotype presentation conditions that determine how to light up the 29, i.e. lighting brightness (intensity), position, lighting time, etc., can be performed using multiple visual field measurement programs, such as screening measurement programs, meridional measurement programs, and glaucoma measurement programs. stored as a measurement program.

The blind spot position optotype storage unit 130 stores the result of detection of an optotype corresponding to the blind spot position, which is performed prior to the start of visual field measurement.

The response storage means 108 is for storing the number of visual targets recognized by the subject and the recognition of the visual targets that are the measurement results, which are input by the subject.

A CDC (graphics 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 these signals on the TV monitor 32. An image signal displaying information is formed and output 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. P/S
Converter 118 converts the parallel digital signal from video memory 112 from parallel to serial to form a video signal and outputs it to TV monitor 32.

Next, the operation of the CPU 102 will be explained based on the flowchart shown in FIG. First, when a desired measurement program is selected from the presentation condition storage unit 104 and the measurement program is determined, the optotype near the blind spot of the eye to be measured is presented, and the optotype that the subject did not recognize is used as the blind spot position optotype. This detection result is stored in the blind spot position visual target storage unit 130.

Next, fixation monitoring conditions are determined, and based on these, visual targets for fixation monitoring are determined. Here, the fixation monitoring conditions are, for example, in the second stage, fixation monitoring is performed using all optotypes detected as blind spot position optotypes;
In the stage 0, fixation monitoring is performed using detected blind spot position visual targets excluding those located in the periphery thereof, and in the 0th stage, fixation monitoring is not performed. The fixation monitoring optotype measurement unit 132 of the CPU 102 stores optotypes used for fixation monitoring based on the determined fixation conditions.

Next, the above-mentioned selected measurement program is read out from the presentation condition storage section 104, and the optotypes for measurement are presented divided into a plurality of groups. When the visual target is presented, the subject switches the recognition switch 16.
Enter by.

Subsequently, the input of the fixation monitoring condition relaxation signal is determined, and if the signal has been input, the number of fixation monitoring targets in the fixation target setting unit 132 of the CPU 102 is decreased, that is, the fixation target number in the second stage is reduced. Visual monitoring conditions are changed to the first stage.

Next, it is determined whether the presentation of one group of targets in the measurement program has ended, and when the end is determined, the CPU
The setting optotype control unit 132 of 102 controls the fixation monitoring optotype setting unit 132 to present an optotype for fixation monitoring. In response to this presentation, the person to be measured turns the cognitive switch 16.
respond by.

It is determined whether or not fixation is being performed based on the response of the subject. In other words, if no fixation monitoring target is recognized, it is determined that fixation is being performed, and if even one is recognized, it is determined that fixation is being performed. It is determined that no fixation is made. If it is determined that fixation is being performed, then it is determined whether the measurement program is finished, and if the measurement program is finished, all measurements are finished.

If it is determined that there is no input in the step of determining the input of the fixation monitoring condition relaxation signal, the process proceeds to the step of determining the end of presentation of one group of optotypes in the measurement program.

In determining whether the presentation of one group of visual targets in the measurement program has ended, if it is determined that the presentation has not ended, the process proceeds to the step of determining whether or not fixation is being performed.

When it is determined in the step of determining whether or not fixation is being made that fixation is not being made, if this is the first judgment, the response data in the response storage unit 108 is completely erased; If it is the second or later determination, the response data after the previous determination that fixation was made is erased. Subsequently, after returning one optotype group in the measurement program, the process proceeds to the above-mentioned optotype presentation condition reading step.

In determining whether the measurement program has ended, if it is determined that the measurement program has not ended yet, the measurement program proceeds to the next one, and then the process proceeds to the step of reading out the optotype presentation conditions.

〔Effect of the invention〕

As described above, in the present invention, after the start of visual field measurement, the blind spot position target can be changed to relax the fixation conditions. This has the effect that visual field measurement can be performed by changing the fixation conditions to suit the eye.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram 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, and FIG.
The figure is a block diagram of the electric circuit of the above embodiment, and FIG. 4 is a flowchart showing the operation of the above embodiment. 10...Housing, 16...Cognition switch,
29...LED, 30...hemispherical dome, 34...
Light pen, 38...Control switch, 1
02... CPU, 103... LED matrix interface, 104... Presentation condition storage unit, 13
0...Blind spot position index storage unit.

Claims (1)

[Scope of Claims] 1. An optotype presentation means for presenting an optotype for visual field measurement, a presentation condition storage means for storing a plurality of different optotype presentation conditions as a measurement program, and the presentation condition storage means. an optotype presentation control means for reading optotype presentation conditions stored in the optotype presentation means and controlling the optotype presentation means; and a corresponding means for responding to the subject's recognition of the optotype presented by the optotype presentation means. and a response storage means for storing a response signal from the response means as measurement data; a blind spot position target storage means for storing a blind spot position target corresponding to the blind spot position of the eye to be measured; and the blind spot position target storage. fixation monitoring optotype setting means for selecting and setting a fixation monitoring optotype to be used for fixation monitoring from optotypes stored in the means; and a setting optotype control means for reducing the number of eye targets, and the optotype presentation control means further controls the optotype presentation means to set the blind spot position optotype of the subject prior to measurement of each eye to be measured. and to display the visual target for fixation monitoring by controlling the fixation monitoring visual target setting means every time a certain number of visual targets are presented during the control of the visual target presenting means according to the visual target presentation conditions. An automatic visual field inspection device featuring: