Abstract

The effect on foveal dark adaptation of pre-exposure of the eye for brief durations to light of relatively low brightness was investigated. Monocular measurements of absolute brightness sensitivity (RL) were made with a modified Crozier-Holway discriminometer. A one degree square, centrally fixated test patch was presented for 0.033 sec. The course of dark adaptation as measured by the RL was investigated following pre-exposures of the dark-adapted eye to 0.10, 1.0, 10, and 100 ft-L for 1, 10, and 100 seconds. Dark adaptation was too slight to be measured by the techniques used in this investigation following pre-exposures of the dark-adapted eye to quantities of light in which the brightness×duration product was 100 foot-lambert-seconds or less. The extent of dark adaptation was found to increase as combinations of pre-exposure duration and brightness increased above that critical value.

© 1956 Optical Society of America

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