Effects of VDT color, eccentricity, and adaptation upon visual fatigue

Abstract

Effects of VDT color, visual field, and dark/light adaptation upon visual fatigue was investigated using cone and rod flicker procedure. The results showed that VDT fatigue as measured by CFF changed as VDT color, eccentricity, and adaptation changed in the visual field. It was found that blue and red, i. e., both extremes of the visible spectrum, strongly caused visual fatigue in the visual field as compared with green and yellow, i. e., middle range of the visible spectrum. Furthermore, VDT visual fatigue decreased as the distance from the fovea increased when measured by red (cone) flicker, whereas it increased up to 10 degree periphery and then decreased when measured by blue (rod) flicker except for white. It was also found that light adaptation decreased the fatigue as compared with dark adaptation. The results indicate that rod and cone local flicker procedure is an useful index for measuring visual fatigue in the periphery and fovea, respectively.