JPH0216721Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a perimetry, more specifically, a perimetry that performs visual field tests using different test modes depending on whether the subject is wearing a correction lens or not. Regarding.

[Prior art] When performing a visual field test, if the subject is emmetropic, has no refractive error, and can clearly see the optotype on the dome, open the single-stage mode and select the optotype from the entire area to be examined. are selected at random and presented in sequence for testing. However, if the subject has a refractive error and cannot see the optotype clearly, a correction lens is used to measure the visual field accurately. Do this. However, since the correction lens and its holding frame themselves limit the field of view, they become an obstacle to peripheral inspection. Therefore, it is common practice to use a correction lens to inspect the central area, and remove it to inspect the periphery.

In this case, with a conventional perimeter, first select an inspection program for the center area, perform the inspection using a correction lens, remove the correction lens after completion, enter a new inspection program for the periphery, and inspect the periphery. Alternatively, by manually inputting the information that a correction lens will be used in advance, the 1-stage mode can be switched to the 2-stage mode, which divides the inspection into the center and peripheral areas and proceeds with the examination in two stages. After inspecting the center using a lens, the lens is removed to inspect the periphery.

[Problems that the invention aims to solve] In such conventional perimeters, the correction lens is attached to the perimeter along with its support frame, and the program is selected or the inspection mode is changed each time. Therefore, there was a problem that the operation became complicated.

The present invention was developed to solve these problems, and provides a perimeter that can determine whether or not a correction lens is attached using a simple means and automatically switch the inspection mode accordingly. The purpose is to

[Means for Solving the Problems] In order to solve these problems, the present invention provides a perimetry that performs visual field tests using different test modes depending on whether the subject is wearing a correction lens or not. , a first test mode in which a visual field test is performed by randomly selecting an optotype from the entire range to be tested, and a second test mode in which a visual field is measured by wearing a correction lens if the subject has a refractive error. If it is determined that there is no correction lens at the start of visual field measurement, the first test mode is executed and the correction lens is installed at the start of visual field measurement. If it is determined that there is, a second inspection mode is executed, and in the second inspection mode, after measuring the central visual field, the correction lens is removed and the peripheral visual field is measured.

[Function] In this way, in this invention, the inspection mode is automatically switched according to the signal from the means for determining whether or not a correction lens is attached, so the program is changed every time a correction lens is attached to the perimeter. There is no need to change the mode or change the mode.

[Example] The present invention will be described in detail below according to an example shown in the drawings.

FIG. 1 shows a schematic diagram of the perimeter according to the present invention. In the figure, the reference numeral 1 indicates the dome of the perimeter, and this dome 1 has an LED.
A plurality of (light emitting diodes) 2 are arranged in a scattered manner. A chin rest 3 is attached to a position facing the dome 1, and the visual field is tested by placing the examinee's chin on this chin rest. Further, a forehead rest 4 for fixing the subject's face is provided corresponding to the chin rest 3. The patient was placed on dome 1 due to refractive error.
If the LED 2 cannot be seen clearly, a holding frame 5 is fitted onto the mounting base 6, a correction lens 8 is attached to this, and a visual field inspection is performed.

Fig. 2 shows the holding frame 5 to which the correction lens 8 is attached.
are shown in more detail. This holding frame 5 is designed so that a switch 7 is activated when the holding frame 5 is fitted onto a mounting base 6 as shown in FIG. 2A.

Further, as shown in FIG. 2B, the holding frame 5 can be made to be rotatable, and when the holding frame 5 is rotated in the direction of the arrow and positioned in front of the subject's eyes, the lower end of the holding frame 5 The structure is such that the switch 7 engages with the switch 7. Although the means for moving the holding frame 5 is not particularly shown, it may be carried out manually or by using a motor, a solenoid, or the like.

FIG. 3 is a block diagram showing the control system of the perimeter according to the present invention.

In the same figure, ROM9 contains the programs necessary for the examination: the normal 1-stage mode and the 2-stage program for refractive error.
It is stored in the form of a stage mode. This ROM 9 is connected to a microprocessor 8, and a switch 7, a light pen 12, a CRT 11, and a response switch 13 are also connected to this microprocessor 8, and similarly arranged in the dome 1 via an LED selector 10. The LEDs 2 are controlled to light up in a predetermined order.

In this embodiment, 44 LEDs are provided, and they are arranged at predetermined locations on the dome 1, as shown in FIG.

Further, a RAM 14 is connected to the microprocessor 8, and predetermined results are outputted to a printer 15 via this RAM 14.

Next, the operation of such a configuration will be explained. First, in the single-stage mode, a test is performed in which the LEDs in the center are randomly lit over the entire range in an order according to a predetermined program.

In addition, if you have a refractive error and need to use a correction lens, for example, group the LEDs into a range within 30° and another range, and first perform an inspection within 30° using the correction lens, then use the correction lens. Remove it and perform other inspections.

First, the power is turned on as shown in step S22 of FIG. 5, then a program is selected in step S23, and parameters are set in step S24. That is, set the LED brightness, background brightness, LED lighting time, lighting interval, etc.
Next, place the subject in a predetermined position and adjust the eye to be examined so that it is in the correct position (step S2).
5).

The microprocessor 8 has no holding frame 5 and executes a one-stage mode program stored in the ROM 9 when a correction lens is not used. If there is a refractive error and a correction lens is attached, the switch 7 is activated and this signal is input to the microprocessor 8.
executes a program in two-stage mode.

That is, it is determined in step S26 whether or not there is a correction lens, and if not, the test is started in step S27, the test subject responds in step S28, and the test ends in step S29. On the other hand, if a correction lens is required in step S26, the correction lens is attached in step S30, followed by a test of the central part in step S31, a response from the subject in step S32, and a test for the central part in step S33. Finish the test. Next, in step S34, the lens is removed, and in step S35, a test of the peripheral area is started.
At step S36, the subject responds, and at step S37, the peripheral test is completed.

The contents of this program are displayed on CRT11,
If changes are required in parameters, etc., input is made using the light pen 12. Also, the test results
It is stored in the RAM 14 and can be output on recording paper by the printer 15.

Note that the above-mentioned response of the subject is performed as follows. That is, when the inspection is started, the microprocessor 8 selects the LED to be lit in the LED selector 10 according to the program stored in the ROM 9.
The LED selector 10 lights up the LED on the dome 1 according to the instruction. The test subject is examined by pressing the response switch 13 while fixating the center of the dome 1 and confirming that the LED 2 is lit.

[Effects of the invention] As explained above, according to the present invention, it is determined by a simple means whether or not a correction lens is used, and the mode is automatically selected accordingly. The inspection mode can be automatically switched by simply deciding whether to wear it or not, which simplifies the operation and prevents erroneous input operations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of the perimeter according to the present invention, FIG. 2A is a sectional view showing the configuration for determining whether or not a correction lens is worn, and FIG. 2B is a sectional view showing another embodiment of the determining means. Figure 3 is a block diagram showing the control configuration of the perimeter of the present invention, Figure 4 is an explanatory diagram showing the arrangement of LEDs attached to the dome, and Figure 5 is a flowchart showing the flow of control. It is a diagram. 1...Dome, 2...LED, 3...Chin rest, 8
...correction lens, 7...switch.

Claims (1)

[Scope of Claim for Utility Model Registration] In a perimetry that performs a visual field test using different test modes depending on whether the subject is wearing a correction lens or not, a visual target is randomly selected from the entire range to be tested. A first test mode in which a visual field test is performed, a second test mode in which a corrective lens is worn and the visual field is measured if the subject has refractive error, and a means for determining whether or not a corrective lens is worn is provided. , If it is determined that there is no correction lens at the start of visual field measurement, execute the first inspection mode, and if it is determined that there is a correction lens at the start of visual field measurement, execute the second inspection mode, and then A perimeter meter characterized in that in the second inspection mode, after measuring the central visual field, the correction lens is removed and the peripheral visual field is measured.