[Skip to Content]
Access to paid content on this site is currently suspended due to excessive activity being detected from your IP address 54.204.161.30. Please contact the publisher to request reinstatement.
[Skip to Content Landing]
Article
March 1960

Rod Activity at Photopic Intensities

Author Affiliations

Brooklyn
From the Division of Ophthalmology, Downstate Medical Center, State University of New York.

AMA Arch Ophthalmol. 1960;63(3):402-408. doi:10.1001/archopht.1960.00950020404002
Abstract

Very little is known about the function of rod cells at illumination levels exceeding the cone threshold. The cones, presumably with a higher level of awareness, dominate the picture at high i n t e n s i t i e s. Although both cone and rod cells cease to function when the intensity level is reduced below their respective thresholds, it cannot be said that the rod cells cease to function when the intensity is raised from scotopic levels to photopic levels above the cone threshold. In the course of dark adaptation one cannot plot rod adaptation during the first several minutes because during this time the cones have a greater sensitivity to light and take over the function of light perception. It is only when the sensitivity of the retina has recovered sufficiently so that intensities below the cone threshold can be recorded that the rod curve makes

First Page Preview View Large
First page PDF preview
First page PDF preview
×