Pupillary oscillation induced by pseudo-isochromatic stimuli for objective color vision test.

Color vision tests are conducted based on subjective responses; however, since subjective responses can be biased and are not uniformly applicable to all individuals, an objective method is required. In this study, we developed a quantitative and user-friendly color vision test, which utilized a psychophysical method based on pupillary responses to color flicker stimuli sampled from the confusion line. The results revealed that power spectral density of pupillary oscillations increased corresponded to the color differences. Our system could eventually lead to a feasible color testing method.