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One of the forms of physiological nystagmus, consisting of a tiny saccade, usually through a visual angle between 1 and 2 minutes of arc (sixtieths of a degree), occurring in random directions three or four times a second while an observer fixates an object visually, necessary to prevent the visual image from disappearing, as an artificially stabilized retinal image does after about a second. See also ocular drift, ocular tremor. [From Greek mikros small + French saccade a jerk, from Old French saquer to pull]

Subjects: Psychology.

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