JPH0359687B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to an automatic perimetry device that automatically presents optotypes according to pre-stored optotype presentation conditions, and more specifically, The present invention relates to an automatic visual field measuring device with an auxiliary lens means that allows an auxiliary lens to be inserted in front of the eye to be measured when measuring the central visual field for a person with an abnormality (presbyopia, myopia, or farsightedness).

[Prior art]

Generally, a perimeter meter is equipped with a screen on the inner surface of a hemisphere, and the eye to be measured for visual field measurement is positioned at the center of the hemisphere, and while gazing at a fixation target placed at the center of the screen, the eye is placed at various points on the screen. This is carried out by presenting optotypes with different brightness to each other and detecting the visual field in which the eye to be measured, that is, the person being measured, can recognize the optotypes and the visual field in which they cannot.

By the way, in a conventional automatic perimetry device equipped with an auxiliary lens, the central visual field can be seen through the auxiliary lens, but the entire peripheral visual field cannot be seen. For this reason, with regard to automatic visual field measuring devices that display optotypes randomly in the central visual field and the peripheral visual field, there is a problem in that the measurement conditions become discontinuous in the peripheral visual field.

On the other hand, with other automatic perimetry devices, there are those that present visual fields using separate routines for the central visual field and peripheral visual field, but with this device, two measurement outputs are obtained, and the visual field of the eye to be measured can be grasped. In order to do this, it is necessary to superimpose these two outputs.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems of conventional automatic perimetry devices, and even when the auxiliary lens is inserted for the subject to measure the visual field, the results of the visual field measurement can be obtained without any problems. The purpose of the present invention is to provide an automatic perimetry device that can perform

[Structure of the invention]

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 an optotype presenting means A for presenting an optotype for visual field measurement, and an auxiliary lens for inserting and removing an auxiliary lens in front of the subject for a subject with refractive error. An auxiliary lens means B, a presentation condition storage means C that stores optotype presentation conditions as an optotype presentation routine by dividing them into central visual field and peripheral visual field conditions, and a routine that advances the optotype presentation routine. and a control means E for forming an optotype presentation control signal and outputting it to the optotype presentation means according to the optotype conditions of the optotype presentation routine being progressed, the routine progressing means is configured to stop the optotype presentation routine when the classification of the in progress optotype presentation routine changes. Therefore, the automatic visual field measuring device of the present invention can be used when the optotype presentation routine shifts from the optotype presentation condition for the central visual field to the optotype presentation condition for the peripheral visual field or vice versa, that is, when the optotype presentation routine is divided into When the index changes, the index presentation is interrupted, allowing the measurer to reliably insert and remove the auxiliary lens.

〔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
A panel 14 attached to the front side of the housing 10 with
It consists of an operation display device 22 attached to a side wall 20 of 0. The lower side wall near the front of the panel 14 has a handle 24 for moving the forehead rest 16 and the chin rest 18 vertically and horizontally. Inside the housing 10, there are a large number of eyes on the entire inner surface for displaying optotypes.
A hemispherical dome 23 in which LEDs are arranged is built in, and the eye to be measured is positioned at the center of the hemispherical dome 23.

Inside the housing 10, an auxiliary lens 50 is further supported by a swinging arm 52 so that a subject with refractive error can visually recognize an optotype presented near the center of the hemispherical dome 23. There is. The swinging arm 52 is pivotally supported by the housing 10 through a pin 54, and has an insertion position shown by a solid line in FIG. 2, where the auxiliary lens 50 is inserted in front of the eye to be measured.
The auxiliary lens 50 can swing between an escape position shown by a broken line in FIG.
The swinging arm 52 can be locked in the insertion position and the ejection position by a locking device (not shown), and the swinging of the swinging arm 52 is controlled by the examiner or the subject using the knob 56. I'll pull over and do it. An auxiliary lens detection switch (not shown) is arranged near the swing arm 52 in the insertion position, and detects that the auxiliary lens 50 is inserted in front of the eye to be measured.

The operation display device 22 includes a TV monitor 30, a light pen 32, a printer 31 located below the TV monitor 30, a control switch 34 located above the TV monitor 30, and a fixed vision monitoring telescope 36. The TV monitor 30 displays the type and distribution of the optotypes presented on the inner surface of the hemispherical dome 23, as well as a plurality of operation commands to be described later. Operate the equipment.

The printer 31 prints the measurement results. In the fixation monitoring telescope 36, the eye to be measured is the hemispherical dome 2.
This system monitors from the front whether the person is gazing at a fixation target placed at the center of the spherical surface of No. 3, and the anterior segment of the eye being measured is monitored through an aperture located at substantially the same position as the fixation target. to monitor. The visual recognition switch 15 is operated by the subject during measurement to output an ON: signal indicating that the visual target has been visually recognized.

The operating instructions for this device are as follows.

(1) Selection of a measurement program, such as a screening program that measures the entire visual field in a screening manner, a meridional program that measures the meridian direction, etc., and is selected using the light pen 32 before starting the measurement.

(2) Selection of the brightness (intensity) of the visual target to be presented. Selected by light pen 32.

(3) Selection of the lighting time of the visual target to be presented. light pen 32
selected by.

(4) Selection of the time interval from one presentation of the presentation target to the next presentation. light pen 3
2.

(5) Start measurement program. Although it is operated by the light pen 32, it is also operated by the control switch 34 before starting the measurement.

(6) Interruption of measurement program. Although it is also operated by the light pen 32, it is operated by the control switch 34 during measurement.

(7) Restoration of measurement program. Although it is operated by the light pen 32, it is also operated by the control switch 34 during measurement interruption.

(8) Output of measurement results from a printer, etc. It is operated by the light pen 32, but after the measurement is completed, it is also operated by the control switch.

Next, the configuration of this embodiment will be explained based on FIG. 3. The I/O interface 100 includes output signals from a light pen 32 and a control switch 34 that are operated by the measurer, and a visibility switch that is operated by the subject to indicate that the target has been visually recognized. 15 and the auxiliary lens detection signal from the auxiliary lens detection means 103 are input, and the input signals are converted into signals that can be easily processed by the internal device and are suitable for printing the measurement results on the printer 32. Convert.

The CPU 102 performs main control of this device, the details of which will be explained later using a flowchart.
The LED matrix interface 104 is the CPU
This is an interface for lighting the corresponding LED under predetermined conditions according to the optotype presentation conditions sequentially read out by 102, and constitutes a matrix of at least two transistor arrays. The presentation condition storage means 106 stores optotype presentation conditions that determine how to light up the LEDs of the dome 23, which are composed of a matrix, that is, multiple combinations of lighting brightness (intensity), position, and lighting time. do. The response storage means 108 stores the response signal inputted via the visual recognition switch 15 of the subject in association with the optotype presentation condition at that time. Thereby, data regarding the visibility of the subject is obtained.

A GDC (graphic display controller) 110 receives an LED array signal, a selected measurement program signal, a signal indicating the position of the lit LED, and the above response signal, and displays information on these signals on the TV monitor 30. It forms an image signal for displaying and outputs it to the video memory 112. The timing control circuit 114 forms an appropriate timing signal from the clock signal output from the clock oscillator 116, and generates a suitable timing signal from the clock signal output from the clock oscillator 116.
2 and 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 function of the COU 102 will be explained based on FIG. 4. When the measurement starts, first, an optotype of the central visual field is presented, and a visual field measurement of the central visual field is performed. When the visual field measurement of the central visual field is completed, it is determined from the output of the auxiliary lens detection means 103 whether or not the auxiliary lens 50 is inserted. When the auxiliary lens 50 is inserted, visual target presentation is stopped. Subsequently, it is determined again whether or not the auxiliary lens 50 is inserted.

On the other hand, when the presentation of the optotype is stopped during measurement with the auxiliary lens 50 inserted, the measurer or the person to be measured uses the knob 56 to move the auxiliary lens 50 out of the field of view of the person to be measured. As a result, the second determination in the flowchart of FIG. 4 as to whether or not the auxiliary lens 50 is inserted becomes NO, and then the peripheral visual field is presented and the peripheral visual field is measured.

Further, when it is determined NO in the first determination of whether or not the auxiliary lens 50 is inserted in the flowchart of FIG. and peripheral vision measurements are taken.

〔Effect of the invention〕

As described above, the present invention is configured such that the optotype presentation routine is stopped when the classification of the indicator presentation routine in which the routine progressing means is progressing changes, so that when it is necessary to insert or remove the auxiliary lens. This provides an opportunity for reliable insertion and removal.

Further, by receiving a signal from the auxiliary lens means indicating whether the auxiliary lens is inserted or removed, the routine progressing means stops only when the auxiliary lens is inserted, so that the auxiliary lens is not inserted when measuring the central visual field. In this case, measurement of the peripheral visual field continues without interrupting visual target presentation, which contributes to shortening measurement time.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of the present invention, Fig. 2 is a perspective view of a visual field measurement device according to an embodiment of the present invention, Fig. 3 is a block diagram of the configuration of the embodiment, and Fig. 4 is shown in Fig. 3.
FIG. 3 is a flowchart showing the operation of the CPU. 10... Housing, 12... Circular hole, 15...
Visual recognition switch, 23... Hemisphere dome, 50... Auxiliary lens, 52... Rocking arm, A... Visual target presentation means, B... Auxiliary lens means, C... Presentation condition storage means, D... Routine progress Means, E... control means.

Claims (1)

[Scope of Claims] 1. An optotype presenting means for presenting an optotype for visual field measurement, an auxiliary lens means for inserting and removing an auxiliary lens in front of the eye to be measured for a subject with refractive error, and an optotype. Presentation condition storage means for storing presentation conditions as an optotype presentation routine by dividing them into those for the central visual field and those for the peripheral vision; a routine progressing means for advancing the optotype presentation routine; control means for forming an optotype presentation control signal according to the optotype presentation conditions of the optotype presentation routine and outputting it to the optotype presentation means, the routine progressing means controlling the optotype presentation routine in progress; An automatic perimetry device configured to stop an optotype presentation routine when a classification changes. 2. The automatic visual field measuring device according to claim 1, wherein the routine progressing means is configured to stop only when the auxiliary lens receives a signal from the auxiliary lens means indicating that the auxiliary lens is inserted or removed. An automatic visual field measurement device characterized by: