Abstract

Using a method of direct magnitude estimation, perceived brightness was measured in the dark-adapted eye with brief flashes of varying duration in the Bloch region (1–100 ms) and retinal lock (0°–40°) for the photopic luminance levels covering the range between 140 and 0.14 cd/m2 in steps of 1 log unit. Perceived brightness increased as a function of flash luminous energy (product of luminance and duration) up to critical duration of approximately 100 ms. The brightness power exponent for brief flash was found to be 0.48 ± 0.01 in the fovea, whereas about 0.44 ± 0.01 in the periphery.

© 1978 Optical Society of America

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Brightness function: Effect of area and duration

R. J. W. Mansfield
J. Opt. Soc. Am. 63(8) 913-920 (1973)

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