EFFECT OF VDT LEADING DISPLAY DESIGN OF DYNAMIC INFORMATION ON USERS' VISUAL PERFORMANCE AND VISUAL FATIGUE

Abstract

ABSTRACT This study investigated the effects of display screen type (CRT and LCD), speed (250 and 300 wpm), text/background color combination (white on black, black on white, blue on white, red on white, and green on white) and jump length (0.35, 0.7, and 1.05 cm) of dynamic information on subjects' visual performance and visual fatigue. Dynamic information on VDT (Visual Display Terminal) was presented by means of “leading” display method which was conventionally used in internet homepage design. Visual performance was measured by the searching error percentage, and visual fatigue was measured by the difference of CFF (Critical Flicker Fusion) and subjects' subjective visual fatigue. The results of this study showed that speed, text/background color combination and jump length had significant effects on subjects' visual performance. When speed was 250 wpm, the subjects' searching error percentage was lower than that of 300 wpm. Subjects' visual performance was improving when the color difference of text/background became larger. When jump length was 0.35 cm/time or 0.7 cm/time (visual angle was approximately below 40.4 min), subjects had the best visual performance. Regarding the subjects' visual fatigue, the difference of CFF was significantly affected by speed. When speed was 250 wpm, the change of CFF was smaller than that of 300 wpm.