Scotopic area-intensity relations at various retinal locations.

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Abstract
Absolute scotopic thresholds were detd. for 10 areas of stimulation at each of 5 different retinal locations. All thresholds were detd. monocularly with the naked eye following at least 30 min. of dark adaptation. The largest area (subtending 57 min. of visual angle) was 64 times larger than the smallest area. Locations of retinal stimulation were 4, 8, 12, 24, and 48 degrees above the fovea. Stimulus durations were 50 and 250 msec. Results showed that area-intensity curves obtained at different retinal locations were parallel, indicating that within the range of this expt. the area-intensity relation is invariant with respect to locus of its detn.

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