New method to generate observation target for contrast sensitivity and color vision inspection of the human eye

Contrast sensitivity and color vision are two important aspects to evaluate the visual function of the human eye. The inspection is widely used in clinical ophthalmology, and of great significance for early diagnosis and identification of ophthalmic diseases. By analyzing the existing principles and shortcomings of the human eye contrast sensitivity and color difference inspection methods, a new method for generating observation target of contrast sensitivity and color vision inspection is proposed in this paper. By using double optical path design idea and integrating sphere and self-developed color mixing systems, two beams of uniform light with specific color and specific luminance can be produced. With subsequent reuse of the optical path, on one hand, accurate measurement of the human visual contrast and the color difference threshold value can be achieved, and on the other hand, measurement and calibration of contrast sensitivity tester and color tester widely used in clinical can be solved by developing assistant calibration transfer tools. Moreover, output parameters for contrast sensitivity and color difference can be precisely adjusted according to need and achieved real-time control and calibration with this method. The research has set the foundation for future establishment of visual threshold measuring device which is especially suitable for scientific and experimental research in clinical ophthalmology and metrology.