Accession Number : AD0767040

Title :   Contributions of Rods and Cones to Visual Thresholds During Dark Adaptation,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSIOLOGY

Personal Author(s) : Brown,John Lott ; Kirschenstein,Alan ; Shupp,Floyd

Report Date : 1960

Pagination or Media Count : 40

Abstract : The spectral sensitivity of the retinal receptors may deviate appreciably from that which would be assigned to them on the basis of either scotopic or photopic luminosity standards. Both the initial 'cone' branches and the secondary 'rod' branches of dark adaptation curves were found to deviate from predicted positions on a scotopic scale of luminance. These results illustrate the importance of empirical evaluations in any situation where the most efficient use of illumination may be essential. In the design of a cockpit lighting system for example, serious errors may be introduced by dependence upon luminosity standards for the determination of energy levels required for visual tasks under various spectral conditions of illumination.

Descriptors :   (*NIGHT VISION, THRESHOLDS(PHYSIOLOGY)), (*RETINA, NIGHT VISION), ADAPTATION(PHYSIOLOGY), EYE, VISION

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE