Abstract
Data are presented on the magnitude and frequency of the involuntary eye motions (rapid motions superimposed on slow drifts) that take place during attempted fixation on a target. A record of these motions was obtained by directly photographing a blood vessel of the eye. Vertical and horizontal motions were recorded for both monocular and binocular fixation. The rapid motions were found to have an average frequency of 50 cps and an average amplitude of 1.2 minutes of arc. These data are in approximate agreement with previous data of Adler and Fliegelman and of Ratliff and Riggs. Simultaneous tracks of head and eye motions show that the rapid eye motions are independent of head motions.
© 1953 Optical Society of America
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