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Meridional Variations in Visual Acuity and Eye Movements during Fixation

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Abstract

An attempt was made to evaluate the contribution of eye movements to meridional variations in visual acuity. The threshold background luminance was determined for the detection of a fine wire at different orientations and exposure durations. In addition, eye movements were recorded under comparable conditions in order to ascertain the magnitude of relative motion that retinal images of such wires undergo due to eye movements. It was found that acuity varies as a function of line orientation in a similar manner with all exposure durations. Differences in the effect of line orientation with different exposure duration appear to be unrelated to the variations in retinal image motion due to eye movements during fixation. It was concluded that for most individuals, the directional nonuniformity of eye movements during fixation is not sufficient to play any role whatever in the meridional variations in the visibility of visual detail.

© 1960 Optical Society of America

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