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Article
March 1948

DISTANCE DISCRIMINATIONIV. Effect of Aniseikonic Lenses on Distance Discrimination

Author Affiliations

COLUMBUS, OHIO; LAWRENCE, KAN.; ANN ARBOR, MICH.; STANFORD UNIVERSITY, CALIF.
From the Vision Laboratory, Department of Physiology, Stanford University School of Medicine.

Arch Ophthalmol. 1948;39(3):333-338. doi:10.1001/archopht.1948.00900020340008
Abstract

In THE first paper of this series on distance discrimination1 it was shown that the results obtained in a test of depth perception might be made to yield two important types of information. If a series of judgments are made, the mean of the distribution expressed in physical units (customarily millimeters) is the position of subjective equality (Es), and from it may be determined the location of pairs of functionally corresponding retinal points. The standard deviation of the distribution (Sx) may be used to determine the size and relative sensitivity of the pair of corresponding areas. It was pointed out in the paper just mentioned that tests (such as the Howard) which are used today to test distance discrimination are scored in a manner which yields a single measure rather than the two parameters, Es and Sx. This single measure, while enabling the comparison of

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