Device and method for measuring visual threshold values

Abstract

The invention relates to a device and a method for measuring visual threshold values, and belongs to the technical field of optical precision measurement. The device for measuring the visual threshold value comprises a first uniform surface light source, a second uniform surface light source, a first fundamental color matching system, a second fundamental color matching system, a first complementary color matching system, a second complementary color matching system, a first color mixing system, a second color mixing system and a beam splitting system. A set of multi-parameter measurement device for the visual threshold values is implemented by utilizing a four-integrating sphere light source system and multiplexing the color matching systems, the color mixing systems and a subsequent light path to generate four observation targets of which the brightness (illuminance), the contrast, the chromaticity and the periodic pattern frequency are variable, and can be used for simultaneously measuring visual illuminance, contrast and chromatic aberration threshold values, so that the device is convenient to operate, wide in measurement range and color gamut adjustment range and higher in light source output power, and a plurality of parameters can be measured.

Description

Technical field [0001] The invention relates to a device and a method for measuring visual threshold, and belongs to the technical field of optical precision measurement. Background technique [0002] More than 95% of the external information that people feel comes from vision, and the quality of visual characteristics is directly related to human production, life and work. In clinical practice, early detection of visual diseases with visual diagnostic equipment and early intervention and treatment is the key to reducing visual disability. With the improvement of material living standards, people pay more and more attention to visual health. Corresponding detection, diagnosis and testing technologies have also been continuously developed, and many new types of visual diagnosis equipment have emerged, such as contrast sensitivity based on visual threshold measurement. Degree tester, color difference tester and perimeter, as well as electrooculogram, electroretinogram and visual e...

AI Technical Summary

Problems solved by technology

[0003] Existing visual diagnostic equipment such as contrast sensitivity testers, colorimeters, and perimetry based on visual threshold measurement are mostly single-parameter tests with limited measurement ranges. To detect visual illuminance, contrast, and color difference thresholds, different instruments need to be replaced To achieve, the operation is complicated and the efficiency is low

Moreover, the technical parameters inside the instrument cannot be accurately calibrated and traced, resulting in a lack of comparability between the measurement results given by different instruments, and the mutual recognition of test results between hospitals cannot be achieved.

Although my country has carried out relevant measurement research on visual diagnostic equipment, established a national measurement benchmark for vertex power, and solved the measurement and calibration of optometry equipment such as comprehensive refractometers and eye charts, the measurement of visual diagnostic equipment based on visual threshold Calibration, there is no solution in China

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