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Monocular versus Binocular Visual Acuity


THIS communication describes experiments in which the threshold contrast of gratings viewed monocularly and binocularly have been determined (Fig. 1). We have modified the technique of Schade1 so that a grating target is generated on an oscilloscope by supplying suitable signals to the x, y and z axes. It could be continuously varied both in contrast and fineness (spatial frequency) without the mean luminance of the screen changing. The energy distribution across the grating varied sinuosoidally. The grating filled a rectangular area subtending 2° by 1.3°, and was surrounded by a circular field of 12° diameter of the same luminance as the oscilloscope screen (80 cd/m2). The screen was viewed from 57 in., and in all the experiments particular care was taken to correct the eye to within 0.12 diopter with spectacle lenses.

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CAMPBELL, F., GREEN, D. Monocular versus Binocular Visual Acuity. Nature 208, 191–192 (1965).

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