Abstract

Sensitivity of the visual function to vertical misalignment in the making of depth judgments was demonstrated for values of vertical prism of 0.5 and 1 diopter when an observer alternated from “normal” viewing to viewing with vertical misalignment. The variables of exposure time and alternation rate were not shown to be significant. The failure to show an expected significance of alternation rate is attributed to the over-all variability of the data and insensitivity of the experimental design. The data are intergrated with those of Ogle on “Stereopsis and vertical disparity,” and Ogle and Prangen on “Vertical divergence and hyperphoria.” Compensatory movements of the eyes and the pressure to respond rapidly are felt to have removed the experimental task from the class of depth tasks studied by Ogle and also to account for the demonstrated sensitivity of the eye to vertical misalignment of the presented images in the making of depth judgments.

© 1956 Optical Society of America

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