Extra-Foveal Scotopic Absolute Threshold and the Distribution of Retinal Rods

Publisher Website
Google Scholar
Abstract
The theoretical expectation that the reciprocal of threshold sensitivity ought be directly proportional to the number of rods per mm.2 is checked by comparison of the data of Stiles and Crawford on the extrafoveal light threshold of 2 subjects and the cell counts of 0sterberg on the temporal horizontal meridian of one subject. Small discrepancies between the 2 sets of data are accounted for by (a) the small number of subjects, (b) approximation of pupillary area and (c) the fact that the largest discrepancy is found in an area having many cones. It is concluded that, in contradiction to Crozier, the quantitative measures are in agreement with the theoretical expectation.

This publication has 1 reference indexed in Scilit: