AREA AND VISUAL THRESHOLD
Author:
Open Access
- 20 January 1938
- journal article
- research article
- Published by Rockefeller University Press in Journal of General Physiology
- Vol. 21 (3) , 269-287
Abstract
1. The variation of threshold with field area was measured in fields homogeneous in rod-cone composition. At 15° above the fovea, an increase in field diameter from 1° to 5° reduces the threshold sevenfold, at 25° above the fovea tenfold. 2. These changes are shown to follow qualitatively from simple statistical properties of the retinal mosaic. Analytic treatment leads to the expression, (A – nt)k I = C, in which A = area, nt = constant threshold number of elements, I = threshold intensity, and k and C are constants. This equation describes the available data accurately, and is the general form of previous empirical area-threshold formulae.Keywords
This publication has 1 reference indexed in Scilit:
- The action of light on the eyeThe Journal of Physiology, 1928