physiological nystagmus

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A form of nystagmus occurring continuously during visual fixation (1), consisting of ocular drifts with visual angles up to about 5 minutes of arc (5/60 of a degree), microsaccades between 1 and 2 minutes of arc, and ocular tremors of about 30 seconds of arc (1/120 of a degree). That these eye movements are essential to vision is shown dramatically by experiments on stabilized retinal images. See also autokinetic effect, filling-in illusion, reafference, saccade, visual suppression.

Subjects: Psychology.

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