JPS60212143A - 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 relates to a visual field measuring device in which a rainbow optotype is formed on a plurality of light emitting elements.

[Prior art]

Conventionally, a visual field measuring device is known in which a plurality of light emitting elements arranged on a visual field measuring surface are sequentially turned on to present an optotype. Only the light-emitting element of the optotype corresponding to the presentation was lit, and the other light-emitting elements were not lit at all.

On the other hand, visual field measurement is performed while presenting an optotype on a visual field measurement surface that is illuminated by a background illumination device and has a predetermined background brightness. Due to the difference in rate, the brightness of the non-lit light emitting elements illuminated by the background illumination device is lower than the brightness of other visual field measurement surfaces, resulting in a problem that a visual field with uniform brightness cannot be obtained.

[Purpose of the invention]

The present invention provides a visual field measurement device that lights up each light emitting element of the visual target that is not presented in accordance with the brightness of the visual field measurement surface when a plurality of light emitting elements with different luminous efficiencies are used as visual targets. With the goal.

A further object of the present invention is to provide a visual field measuring device which is arranged on a visual field measuring surface to form a matrix and causes a plurality of light emitting elements having different luminous efficiencies to emit light with uniform brightness. do.

[Structure of the invention]

The present invention has the following structural features to achieve the above object. That is, the present invention, as shown in FIG.
In a visual field measuring device having a plurality of light emitting elements A forming a matrix and arranged as optotypes, and an optotype presentation control means B for lighting up the light emitting elements and presenting an optotype according to predetermined optotype presentation conditions, It is comprised of a background lighting means C that lights up optotypes that are not presented at a frequency higher than the critical fusion frequency and with the average brightness of each light emitting element being adjusted to the above-mentioned brightness.

The present invention further provides that the background lighting means C includes a data storage means O for storing lighting data for each of the light emitting elements according to the characteristics of the light emitting elements, and a data storage means O for storing lighting data for each of the light emitting elements according to the characteristics of the light emitting elements; and a background lighting control means E for lighting the light emitting elements of the optotype.

〔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 circular hole 12 for inserting the face of the person to be measured, and a flannel 14 attached to the front side of the housing 10, through which the person to be measured can place an optotype. a recognition switch 15 that is turned ON when recognized;
It consists of a forehead rest 16 and a chin rest 1B attached to the housing 10 for fixing the measurement target in a predetermined position, and an operation display device 22 attached to the side wall 20 of the housing 10.

The lower side wall near the front of the panel 14 has a nondle 24 for moving the forehead support 16 and the chin rest 1B vertically and horizontally. Inside the I-Using 10, a hemispherical dome 23 is built in which a large number of LEDs are arranged over the entire inner surface in order to present the entire optotype, and the measurement target is located at the center of the hemispherical dome 23.

The operation display device 22 includes a TV monitor 30 and a light pen 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. Select an operation command using the light pen sz and the control switch 34 to start the device. Manipulate.

The printer 31 prints the measurement results. The fixation monitoring telescope 36 is used to monitor from the front whether or not the person to be measured is gazing at the fixation target placed at the center of the spherical surface of the hemispherical dome 230. The anterior segment of the eye being measured is monitored through the entire hole.

The operating instructions for this device are as follows.

(1) Selection of a measurement program, for example, a screening program that measures the entire visual field in a screening manner;
This is a meridional program that performs measurements in the meridian direction, and is selected by the light ben 32 before starting the measurement.

@ Light Ben 32 selection of brightness and intensity of the visual target
selected by

Q) Selection of the lighting time of the presentation target. Selected by lightben 32.

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

(To) 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.

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

(η Restoration of measurement program. Operated by light ben 32, but during measurement interruption, control switch 34
It is also operated by

") Output of 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 interface 100 receives output signals from the light ben 32 and control switch 34 operated by the measurer, and an output signal from the recognition switch 15 operated by the subject to indicate whether or not the visual target has been visually recognized. The input signal is manually converted into a signal that can be easily processed by the internal device, and the measurement result is converted into a signal suitable for printing by the printer 32.

CPLII 02 performs main control of this device, the contents of which will be explained later using a flowchart. The presentation condition storage means 106 determines how the LED of the dome 23 is lit, and stores the combination of the friend optotype presentation condition (ie, the brightness and intensity of the lighting), the position, and the -IIL number of the lighting time. The response storage means 108 stores the response signal inputted via the subject's cognitive switch 15 in association with the optotype presentation condition at that time. Thereby, data regarding the visibility of the subject is obtained.

GDC (graphic display controller) 11
0 forms an image signal that displays the information of these signals on the TV monitor 30 that 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 transfer this to video memory 112
Output to.

For example, the GDC11G with NEC (registered trademark) μPD
72.20 is available. Timing control circuit 114
forms an appropriate timing signal from the clock signal output from the clock oscillator 116, and GDCl 1 G,
It outputs to the CPU 102 and video memory 112.

The P/S converter 118 converts the parallel digital signal from the video memory 112 from parallel to serial to form a video signal and outputs it to the TV monitor 30/enables either the buffer 122 or the twelfth buffer 124 and outputs the video signal. is input into the matrix interface 126. The first /< sofa 122 is for the purpose of displaying optotypes, and outputs the presentation condition signal from the presentation condition storage means 106 to the matrix interface 7/8 126, so that the first sofa 124Fi is turned on when the optotype is not displayed. The index lighting signal including the efficiency correction function from the correction data storage means 128, which will be described later, is transmitted to the matrix interface 7Ace 12.
Output to 6.

As shown in FIG. 7, the matrix interface 7/8 126 lights up the optotypes that are not presented, which are sequentially read out from the optotype presentation conditions and correction data storage means 128 by the CPU 102, in accordance with the background brightness. F), AI or 1620 is an interface for lighting a predetermined LED 200 under a predetermined condition based on correction data for
Transistor array 2 having a boat and controlling a column
02 and a transistor array 204 having A2/ to AdaO ports and controlling the rows, forming a matrix. The LED matrix is constructed by connecting the LEDs 200 to the AI or Muda 0 ports of the matrix interface 7/8 126 as shown in FIG.

The address signal forming means 130 controls the correction data storage means 128 based on the timing signal received from the CPU 102.
It forms an address signal for reading out the correction data stored in the correction data storage means 128 and outputs it to the correction data storage means 128. The address signal specifies the row/column line of the table in the correction data storage means 128.

The correction data storage means 128 stores correction data for correcting differences in luminous efficiency, that is, brightness, of a large number of target LEDs 2GG forming a matrix of columns and rows. The correction data is stored as a correction table as shown in FIG. That is, in the correction table, the line numbers of the matrix are arranged in the row direction, that is, the horizontal direction, the 7th column to the 2θ column are the column lines of the matrix, and the 2/ column to the 70th column are the rows of the matrix. It's a line. On the other hand, the column direction, that is, the vertical direction, of the correction table represents the reading order, where / to g is the correction data of the ig1 row of the matrix, 9 to it, i'y to 2g..., lS3 to /60 are the second and third rows of the above matrix, respectively.
This is the correction data of the second θ row. This correction data storage means 128 outputs correction data in response to an address signal formed by an address signal forming means 13G, which will be explained later, and the output is performed in seven lines for each column. When looking at one line, it has a so-called latch function in which the immediately previous data continues to be output as long as the output does not change when the same data is being read.

FIG. 3 shows a correction table stored in the correction data storage means 128. Assuming that the first correction data, that is, up to rows / to g have been read out in the correction table, this corresponds to the boat with the transistor play 20 during this period. Of the 2/ to 4to columns, only the 27th column is all/
Yes, the 27th column to g4tθ column are all 0, so the 27th row, that is, matrix interface 12
Only the LECI 200 connected to the A, 2/ ports of the TO/Zister array 204 constituting 6 can be lit, and the LEDs in the first row of the LED matrix are corrected. On the other hand, looking at the first column of the correction table, the first to fifth rows are / and the sixth to 81st rows are 0, so the first column and first row controlled by the matrix interface 126 The LED 200 is lit during the readout period from KX to S as shown in FIG. Looking at the second column of the correction table, the first to sixth rows are /, and the seventh to third rows are 0.
Therefore, the LED 20G in the first row and λth column, which is controlled by the matrix interface 126, is lit only during the period /.

Therefore, the LED 200 in the 1st row, 1st column is lit longer than the LED in the 1st row, 1st column by the period of /, but this is because the LED 200 in the 1st row, 1st column, LED of
This is to compensate for the fact that the luminous efficiency of the LED in the first row and second column is lower than that of the LED. This readout continues until the last correction data in the 20th row, and is repeated at a frequency equal to or higher than the critical fusion frequency while the visual target is presented, as will be described later. Therefore, for the person being measured, Talpo
As shown in Grateau's law, it is perceived as uniform brightness. On the other hand, the correction data is determined in accordance with the luminous efficiency of each light emitting element 20G so that the background luminance caused by the background illumination trap is felt to the person being measured or determined. As explained above, reading out the correction data in this configuration is performed by reading out the correction data using 1 for each face from the 1st row of the LED matrix, that is, from the 1st column to the 20th column in chronological order.
The correction data group will be read out. In this case, a huge amount of correction data will be read out from the correction data storage means 128 at high speed, but it will not be read out directly by the CPU 102, but will be read out using the timing determined by the CPU 102, and the address signal itself will be read out from the correction data storage means 128. Since the signal forming means 130 forms the signal, there is no burden on the CPU 102.

The background illumination device 132 illuminates the inner surface of the hemispherical dome 23 with a predetermined brightness based on the output of the l/θ interface 10G.

Next, the operation of the visual field measuring device of this embodiment will be explained with reference to FIG. When you start measuring, the selector 120 CP
The first buffer 122t is selected based on the output from U102, and the indicator presentation condition signal successively issued by the CPU 1020 command is input to the matrix interface 126, and the visual indicator is presented according to the condition.

Next, selector 1 is selected by the output from CPtJ102.
20 is the first buffer 122t-selected, while the CPU 102
The address signal forming means 128 forms an address signal based on the output of , and outputs it to the correction data storage means 13G. L is input via the matrix interface 126 by inputting the address signal of the correction data storage means 13G.
Turn on the ED to the same brightness as the background lighting.

Next, it is determined whether all the correction data in the correction data storage means 128 has been read and executed, and if NO, the process proceeds to the step of forming the address signal. If it is determined that all correction data reading and execution have been completed, it is then determined whether or not the measurement has been completed, and if the measurement has not yet been completed, the selection of the first buffer is performed. Proceed to step. This operation stops when it is determined that the measurement is complete. The above routine is designed to prevent the subject from feeling the flickering of the background illumination and to make them feel as if the display of the optotype and the illumination of the background compensation are occurring in parallel. It is repeated at a rate corresponding to a frequency higher than the fusion frequency.

〔Effect of the invention〕

According to the present invention, in a perimetry device using a plurality of light-emitting elements as optotypes, a method for lighting a light-emitting element that is not displaying an optotype at a frequency equal to or higher than a critical fusion frequency with an average luminance equal to that of a background surface; For the person to be measured, the situation is the same as a background surface illuminated with uniform brightness, and a visual field measuring device that can perform highly accurate visual field measurements can be obtained. Furthermore, if the efficiency, etc. of the light-emitting elements that make up the optotype of the visual field measurement device are different, the difference in efficiency of the light-emitting elements can be corrected by correcting the lighting time according to the characteristics of the light-emitting elements. can be compensated.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the entire structure of the present invention, Fig. 1 is a perspective view of a visual field measuring device according to an embodiment of the present invention, Fig. 3 is a block diagram of the composition of the embodiment, and Fig. 3 is a light emitting element. FIG. 5 is an explanatory diagram of the correction data; FIG. 6 is a waveform diagram showing the lighting timing of the light emitting element according to the correction data shown in FIG. S; FIG. 7 is a flowchart diagram showing the operation of the embodiment. It is. 8. Light emitting element B Visual target presentation control means C'R1 Lighting means D Data storage means 10 Housing 15 Recognition switch 23 Hemisphere dome 02 CPU 106 Presentation condition storage means 108 Response storage means 10GDC 118P/S converter 112 Video memory 122 First buffer 124 1 buffer 126 Matrix interface 128 Correction data storage means 130 Address signal forming means Fig. 5 Fig. 6 123456 910111213

Claims (1)

[Claims] /) A plurality of light-emitting elements forming a matrix are arranged as optotypes on a background surface with a predetermined brightness, and the light-emitting elements are turned on according to predetermined optotype presentation conditions to present the optotypes. In a visual field measurement device having an optotype presentation control means, lighting the light emitting elements of the optotypes for which no optotypes are presented at a frequency equal to or higher than the critical fusion frequency so that the time average luminance of each light emitting element matches the background surface luminance. A visual field measuring device comprising: background lighting means; 2. In the visual field measurement device according to claim 1, the background lighting means includes a data storage means for storing lighting data according to the characteristics of each light emitting element, and reads out the lighting data from the data storage means. 1. A visual field measuring device comprising: background lighting control means for lighting up light-emitting elements of optotypes that are not presented with the optotype. 3) Percentage Permissible In the visual field measuring device according to claim 2, the lighting data is formed by a lighting data group indicating the lighting state of each light emitting element corresponding to the lighting time, and the background lighting means is configured to control the lighting. A visual field measuring device characterized by reading data in chronological order.