Abstract

Experimental results concerning the behavior of the contrast threshold are given as obtained from about 100,000 responses of the same subject.

The circular test spot of size d between 6.6′ and 8° was projected 7° nasal from the fovea. Green light was used for background and test spot. The stimulus exposure t was varied between 0.02 and 1 second.

So long as d and t are small, the behavior of ΔB/B agrees with the explanation of de Vries: ΔB~B12. The dependence of the sensitivity of the eye on B is calculated from the precise shape of the curve for ΔB as a function of B for these combinations of d and t. The result does not contradict direct measurements of the sensitivity.

© 1950 Optical Society of America

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