Abstract

The effects of low-brightness short-duration pre-exposures on peripheral dark adaptation were investigated. Three peripheral locations: 2 deg, 6 deg, and 18 deg, were tested with a square 1-deg test patch of 0.033 sec duration. Pre-exposure was to a centrally fixated circular field which subtended 55-deg diam. Monocular curves were obtained after pre-exposures of 0.01, 0.1, 1, and 10 ft-L each presented for 1 and 10 sec. All pre-exposure conditions resulted in some loss of sensitivity at the 2-deg location; pre-exposure combinations of 0.01 and 0.1 ft-L-sec resulted in little if any loss of sensitivity at the 6-deg and 18-deg locations.

© 1960 Optical Society of America

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