Circadian changes in CFF thresholds of 28 children, 14 boys and 14 girls, were investigated. Binocular thresholds were obtained by the method of limits from 9 a.m. to 9 p.m. in 5 sessions, spaced 3 hr. apart. A diurnal effect was found, namely, a rise and a decline in CFF values with a peak at 12 p.m. (p < .01). Though an additional rise in CFF was noted at 6 p.m., this trend was not significant. It was concluded that CFF fluctuated with time of day and that these fluctuations should be explored in relation to other physiological and psychological functions subject to circadian effects.
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