Abstract

Is the flicker limit governed by the Ferry–Porter law or by some other law? We previously obtained strong evidence for the wide applicability of the Ferry–Porter law and for its variation with eccentricity [ J. Opt. Soc. Am. A 7, 743 ( 1990)]. Raninen and others [ Vision Res. 28, 785 ( 1988); Vision Res. 31, 1875 ( 1991)] have questioned our analysis of the data and our conclusions. We show that their criticism of the Ferry–Porter law is based on specious analyses and that their own data support the Ferry–Porter formulation. We also provide further evidence that the slope of the Ferry–Porter function increases markedly with eccentricity, implying that the inherent temporal properties of the retina grow more rapid with distance from the fovea.

© 1993 Optical Society of America

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