Visual acuity and distance of observation.

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Abstract
Visual acuity was detd. at 8 observation distances which varied between about 30 ft. and about 2 miles. The results show that visual acuity may be considered to remain practically constant over this range of distances. The slight discrepancies from constancy seemed explicable in terms of changes in contrast and illumination. Failure to find any marked decrement in acuity at large distances was considered to support a peripheral theory of the Aubert-Foerster phenomenon, insofar as such a phenomenon is demonstrable. It was concluded that a careful expt. is required in which visual acuity is measured at short distances with adequate control of configurational factors.

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