November 1990
Volume 31, Issue 11
Free
Articles  |   November 1990
Rod outer segment length and visual sensitivity.
Author Affiliations
  • C J Bassi
    Department of Psychology, Vanderbilt University, Nashville, Tennessee.
  • M K Powers
    Department of Psychology, Vanderbilt University, Nashville, Tennessee.
Investigative Ophthalmology & Visual Science November 1990, Vol.31, 2320-2325. doi:
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      C J Bassi, M K Powers; Rod outer segment length and visual sensitivity.. Invest. Ophthalmol. Vis. Sci. 1990;31(11):2320-2325.

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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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