Metrological research on human color vision characteristics

Color difference threshold is an important parameter to evaluate human color vision characteristic, which is of great significance for early diagnosis and inspection of ophthalmic disease. The test of color vision characteristics has experienced the process from qualitative to semi-quantitative to quantitative. Based on the analysis of existing color vision test methods, a new method is proposed by using three-integrating sphere system and specially made color modulators with optical modulation principle, which can generate required test targets of different luminance and color. Then an automated measurement system is established which can realize the color difference threshold measurement quantitatively. The output parameters can be precisely adjusted and achieved by real-time control, and be traceable to the existing luminance and color standards with metrological control. By metrological evaluation, the color coordinate repeatability is 0.0003 and reproducibility is 0.004 for color modulation, and the color difference repeatability is within 0.30 and reproducibility is not over 1.0 for color vision test targets generated. Experiments show that the measurement system can generate required color vision test targets and realize the color visual threshold measurement well. With the advantage of large color modulation range and adjustable test target, the system can meet test needs of personalized human color vision in many related scientific research fields.