Abstract
The effect of exposure time from 0.1 to 1.1 sec on the critical flicker frequency (CFF) was studied. For all five subjects the CFF drops with shortening of the exposure time below 0.5 to 0.7 sec, gradually to 0.2 sec and steeply below 0.2 sec. The steepness of slope varied with the light–dark ratio (LDR) in the following order from most to least pronounced: LDR = 1:9, 5:5, 9:1. The data were plotted in terms of “critical number of flashes,” i.e., the number of light flashes at fusion multiplied by exposure time in milliseconds, versus exposure time. There was a linear relationship between 0.2 to 0.9 sec.
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