Abstract

The nature of the drift of the eye during monocular fixation was investigated by recording vertical and horizontal components of eye movements under a variety of viewing conditions. Extinguishing the fixation mark, or placing it at 30 cm instead of at optical infinity was found to increase the net absolute drift rate, as well as to alter the preferred direction of drift. This suggests, as do some previous findings, that the drift of the eye is at least indirectly influenced by visual factors. Changing the position of the viewing eye in the head produced systematic shifts in the preferred direction of drift. The relationship of these findings to various aspects of monocular and binocular fixation were discussed.

© 1961 Optical Society of America

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