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.
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