The Sensitivity Differences Measured by CFF between Central and Peripheral Retina

Abstract

CFF (Critical Flicker Frequency) determinations were made at various retinal positions by using a fixation point to which the line of vision is fixed in the first test and by employing a moving target which led the line of vision in the second test.
It is inferred from the results of the tests that CFF in the periphery is higher than that in the fovea when the target size is larger than 2°, and that the variation of OFF according to the locality on the retina in the case where the target size is very small (less than 1/8°) depends basically upon the density distribution of cones and rods on the retina.
It is also pointed out that CFF is higher during eye movement than when the line of vision is fixed, especially when the target size is large and in the periphery of the retina.