Abstract

Threshold luminance was determined at various eccentricities along the horizontal nasal meridian of the dark-adapted retina of one subject. If test-flash duration is brief, threshold is almost independent of eccentricity, in the range investigated. If the duration exceeds, say, 12 ms, sensitivity deteriorates beyond 40°. Luminance–time relationships reveal that the total integration time decreases as the distance from the fovea is increased beyond 40°. This, however, is no longer the case when oblique-ray astigmatism is suitably corrected; total integration time attains an unexpected value (1 s) and sensitivity, as determined with long-duration flashes, increases as eccentricity is increased. The relation between size of the minimal-blur disk and size of receptive field is discussed.

© 1971 Optical Society of America

Luminance–Time Relation at Various Eccentricities: Individual Differences*

Lucia Ronchi and Olga Nováková
J. Opt. Soc. Am. 61(1) 115-118 (1971)

Photochromatic Intervals as a Function of Retinal Eccentricity for Stimuli of Different Size*†

Lothar Spillmann and Susan Seneff
J. Opt. Soc. Am. 61(2) 267-270 (1971)

Spatial and Luminance Determinants of the Increment Threshold under Monoptic and Dichoptic Viewing*†

Joseph I. Markoff and Joseph F. Sturr
J. Opt. Soc. Am. 61(11) 1530-1537 (1971)

Visual Latency as a Function of Stimulus Onset, Offset, and Background Luminance*

Ralph W. Hansteen
J. Opt. Soc. Am. 61(9) 1190-1195 (1971)

Adaptation and Critical Duration for Stiles π Mechanisms

Toshio Uetsuki and Mitsuo Ikeda
J. Opt. Soc. Am. 61(6) 821-828 (1971)