Rod outer segment length and visual sensitivity.

C J Bassi; M K Powers

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PubMed · 2242998

Rod outer segment length and visual sensitivity.

C J Bassi·M K Powers

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Abstract

Detection threshold for the rod system was measured psychophysically in adult goldfish before and after exposure to constant illumination of 340 lux (91 microW/cm2) for 7 days. As shown in the previous paper, rod outer segment (ROS) length increases an average of 60% under these conditions. The present work shows that visual sensitivity also increases, in approximate proportion to the additional optical density predicted by the longer ROSs. These results are the first to show that exposure to constant light can enhance visual sensitivity. They imply further that detection threshold is related to ROS length. Apparently, the photopigment in the ROS tips that is normally shed on a daily basis retains its photon-catching ability.

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Animals Goldfish Light Psychophysics Rod Cell Outer Segment Sensory Thresholds Vision, Ocular Journal Article Research Support, U.S. Gov't, Non-P.H.S.Research Support, U.S. Gov't, P.H.S.

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C J Bassi, M K Powers. 1990. Rod outer segment length and visual sensitivity.. https://pubmed.ncbi.nlm.nih.gov/2242998/

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