JPS60241418A - 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 provides a plurality of optotype presentation conditions, namely, the position of the optotype,
An automatic perimetry device that automatically presents optotypes under optotype presentation conditions that vary in brightness, presentation time, presentation interval, etc. More specifically, it presents optotypes in a high density in a specific area at the beginning of optotype presentation. This invention relates to an automatic perimetry device that makes it possible to diagnose a specific disease without even presenting the entire optotype.

[Conventional technology]

As an example of a conventional automatic perimetry device, one optotype presentation program is composed of 50 to 200 optotype presentations,
Some programs are known in which visual target 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 eliminates the predictability of the subject and ensures accurate measurement. Therefore, 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. This poses a problem in that it must be imposed on the person to be measured.

The present invention has been made in view of the above-mentioned conventional problems, and the present invention presents optotypes at a coarse density in areas other than the above-mentioned specific areas,
An object of the present invention is to provide an automatic visual field measurement device that can efficiently measure visual targets for discovering and diagnosing specific diseases.

The present invention further provides an optotype display that includes areas other than the specific area, thereby presenting the optotype only for a specific area where a visual field defect related to a specific disease occurs, and predicting the presentation of the subject. An object of the present invention is to provide an automatic perimetry 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, as shown in FIG. 1, the present invention includes a step 1 for presenting an optotype having a tilted optotype, and a specific stage for presenting an optotype in a specific area of the measurement visual field with higher density than in other areas. A presentation condition description that describes at least one presentation step (
, Q means 2 and the above-mentioned specific step stored in the presentation condition storage means 2 are first read out, and then other presentation steps are read out to form an optotype presentation signal, and the optotype V ice is set by the operator's operation. an optotype presentation control means 3 for forming an interruption signal; a response means 4 for allowing the person to be measured to respond to the means presented by the optotype-indication-f stage 3; a response storage means 5 for storing the response of the subject in correspondence with the optotype presentation condition being presented, and an output stage 6 for outputting the response of the subject stored in i+2 by the response storage means 5. be done.

Further, in an embodiment of the present invention, the specific region of the specific presentation step is constituted by a so-called Bjelm region with a reference angle of 10' to 20' and a Nazarstenop region.

Furthermore, in another embodiment of the present invention, the optotype presentation control means includes a random number generator, and the optotype presentation at 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.

As shown in FIG. 2, the automatic visual field measuring device includes a housing 10, a panel 14 provided with a circular hole 12 for inserting the face of the person to be measured and attached to the front side of the housing IO, a recognition step 16, and a recognition step 16. Housing 1 to fix in position
The device has a measurement limit fixing part 22 consisting of a forehead rest 18 and a chin rest 20 attached to the housing 10, 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 measurement limit fixing section 22 vertically and horizontally. Housing 1
Inside the 0, there are many LEs all over the inner surface to present optotypes.
A hemispherical dome 30 in which D29 is arranged is built-in.

The operation display device 2G includes a TV monitor 32 and a light pen 3.
4. Printer 36 located below the TV monitor 32;
Control switch 3 located above the TV monitor
8 and a fixation monitoring telescope 40. TV monitor 32
The type and distribution of the optotypes presented on the inner surface of the hemispherical dome 30, as well as a plurality of operation commands to be described later, are displayed, and the operator selects an operation command using the light pen 34 and the control switch 38 to operate the device.

Printer 36 prints the measurement results. The fixation monitoring telescope 40 monitors from the front whether or not the person to be measured is gazing at a fixation target (not shown) placed at the center of the spherical surface of the hemispherical dome 30. The anterior segment of the eye to be measured is monitored through the apertures at substantially the same location.

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

The I10 interface 100 receives the light pen 34 operated by the measurer, the output signals from the control switch 38, and the recognition signal from the recognition step 16 which inputs whether or not the person to be measured has recognized the visual target. The human input signal is transformed into a signal suitable for processing by internal equipment and the measurement result is converted into a signal suitable for printing on a printer 36. Although the explanation here is based on the assumption that the person being measured operates the recognition switch 16, the measurer receives the recognition from the person and then ``Lie!''・You may input using a pen.

The CPU] 02 performs main control of this device, and performs various timing controls in addition to the contents described later using a flowchart.

The LED matrix interface 103 is a CP
This is an ink face for lighting the corresponding LED 29 under a predetermined condition according to the optotype presenting condition read out by tJ102, and an matrix is formed by at least two transistor arrays.

The presentation condition storage unit 104 stores combinations of optotype presentation conditions that determine how the LEDs 29 of the dome 30 are lit (i.e., brightness and intensity of lighting), positions, lighting times, etc. as a plurality of visual field measurement programs. are doing.

The glaucoma test program, which is one of the visual field measurement programs stored in the presentation condition storage section a 104, is
As shown in the figure for the left eye test, the optotype 20 is not indicated by a black circle.
It consists of a first step in which 0 is presented, and a second step in which an optotype 202 is presented instead of a white circle. Visual target 2 of the first step
00 is distributed over the entire measurement field, but the reference angle 1
The distribution density of the so-called Bjelm region sandwiched between circles 204 and 206 and the region extending outward from the symmetrical position of the blind spot with respect to the fixation point (hereinafter referred to as the "Nazarstenop region") is It is higher than the distribution density of the visual target 200. The composition of this visual target distribution density is
Visual field defects caused by glaucoma tend to occur in the Bjerm area and the Nazarethop area, and glaucoma can generally be detected and diagnosed by measuring the visual field only in these areas.

The optotype 202 of the second step has a general visual field measurement optotype distribution excluding the optotype 200 of the first step, 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 addition, in order to eliminate measurement inaccuracies due to predictions of the 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 that is horizontally inverted.

12DC (graphic display controller) 1
Reference numeral 10 generates an image signal for displaying the information of these signals on the rv monitor 32 by manually inputting the LED array signal, the selected measurement program signal, the signal indicating the position of the lit LED, and the above-mentioned response signal. Form this and write it as a video memo I
Output to J l l 2.

Timing control circuit 114 forms a suitable timing signal 13 from the clock signal output from clock generator 116 and outputs it to GDC 110, CPU 102 and video memory 112.

The p.p,'5itii 118 converts the parallel digital signal from the video memory 112 into a parallel-to-serial converter to form a video signal, and outputs the video signal to the monitor 32.

Next, the operation of the CPU 102 will be explained based on the flowchart shown in FIG. First, a predetermined program is selected from the measurement programs displayed on the monitor 32 using the light ben 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 unit 104, and
1.L E I) arranged on the inner surface of the semi-TA l'-me 30 via the ED matrix interface 103
29 are sequentially turned on to present visual targets.

On the other hand, the response of the subject to the presentation of the optotype is manually inputted and stored through the recognition step 16.

Further, the measurer inputs a command to output the measurement results to the 1'V monitor using the light pen 34 while observing the presentation of the optotype and the response status of the person to be measured. In other words, the measurer can input an output command to stop the visual target presentation at any time during the visual target presentation when he or she determines that the visual target is sufficient for diagnosing glaucoma.

If this output command signal is not input, it is then determined whether or not the first step of displaying the optotype has ended. 1st
If the presentation of visual indicators for the step is completed, then the second step is completed.
It is determined whether or not the visual target presentation of the step has been completed, and if it has been completed, the measurement results are output, and it is determined whether all measurement procedures have been completed, and the program ζ performs all measurements. There are many copies.

In determining whether or not the output command signal is 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 stage.

A visual target is displayed.

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

Furthermore, if it is determined that all the measurements have not been completed in the determination as to whether or not all the measurements have been completed, the process proceeds to the step of determining whether the output command signal indicated by "-" is input manually or by a machine.

〔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 the discovery and diagnosis of the disease, taking into account the specific disease and the characteristics of the visual field defect that develops therein. The present invention is configured so that presentation of the optotype can be stopped at any time, 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 a rough distribution density in other visual fields and presenting these randomly, thereby 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 of the same embodiment, and Fig. 4 is an optotype. FIG. 5, which is an explanatory diagram of the visual target distribution in the presentation step, is a flowchart showing the operation of the CPU. 10-housing, 16-recognition switch, 26-operation display device, 29-LED, 30-hemisphere dome, 32-
TV monitor, 36-=printer, 38-control switch, 100-110 interface, 102.
- CPU, 103 - LED matrix, 104
- Presentation condition storage unit, 108 - Response storage unit. Patent applicant: Tokyo Kogaku Kikai Co., Ltd. Figure 1

Claims (1)

[Scope of Claims] 1) An optotype presentation means having a plurality of optotypes, and a display storing at least one specific presentation step for presenting optotypes in a specific area of the measurement visual field at a higher density than in other areas. Condition storage means and the specific presentation step stored in the presentation condition storage means are first read out, other presentation steps are read out using J* to form an optotype presentation signal, and the optotype presentation is interrupted by an operator's operation. an optotype presentation control means for forming a signal; a response means for the subject to respond to the optotype presented by the optotype presentation means; and a response means for the subject to respond to the optotype presented by the response means; An automatic visual field measuring device comprising: a response storage means for storing responses corresponding to display conditions; and an output means for outputting the responses of the subject stored by the response storage means. 2) The specific area of the above specific step has a reference angle of 10°.
2. The automatic perimetry device according to claim 1, comprising a so-called Bjelm area of 20° to 20° and a nazal step area. 3) The optotype presentation control means includes a random number generator, and in each optotype step, the optotype presentation is performed randomly over the entire measurement field of view based on the output of the random number generator. The automatic perimetry device described in Section 1.