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Using flash luminance covering the range between 44 and 94 dB re 10-6cd/m2 in steps of 10 dB units, visual latency (tL) was measured at three different retinal loci: 0°, 20°, and 40° nasal side of the right eye. The tL measured for five subjects decreased as a power function of luminance: As luminance increased, tL decreased and for the higher luminances approached a fixed asymptotic latency of tL. The tL was fitted to the power function of the form, tL-t∞=k•Iβ, where t∞, β, I, and k indicates asymptote, exponent, luminance, and constant, respectively. The exponent β decreased as retinal eccentricity increased, whereas the asymptote t∞ increased as eccentricity increased. Estimated mean β was found to be -.31±.01 in the fovea and -.23±.02 (20°) to -.20±.02 (40°) in the periphery. The differences of the exponent were discussed in relation to the brightness exponent in the fovea and in the periphery.

EFFECT OF LUMINANCE ON LATENCY POWER FUNCTION IN THE PERIPHERAL VISUAL FIELD