Brightness exponent for the periphery in the Bloch region
- 1 January 1978
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America
- Vol. 68 (1) , 140-142
- https://doi.org/10.1364/josa.68.000140
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.Keywords
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