Abstract: Critical flicker fusion frequency, recognition time on the Snellen Chart, and brightnessdiscrimination were employed as measures of visual fatigue of pupils resulting from con-tinuous reading for an hour under various levels of illumination of sun light and artificiallight. Results indicated that 80 lux may be recommended as the necessary illuminationlevel and 180 lux as the comfortable level required for pupils' desks in daylight. A com-parison of the effects of the two artificial light sources showed that under low illumina-tion the incandescent lamps were better than flourescent lamps. It was suggested that60-70 lux for incandescent lamps and 90-100 lux for flourescent lamps may satisfy thedesk illumination requirements for visual tasks in elementary and middle schools.

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