- voluntary nystagmus
- rapid rhythmic eye movements, up to 80 a second, that can be produced at will by some normal individuals.
Medical dictionary. 2011.
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Nystagmus — Rapid rhythmic repetitious involuntary (unwilled) eye movements. Nystagmus can be horizontal, vertical or rotary. * * * Involuntary rhythmic oscillation of the eyeballs, either pendular or with a slow and fast component. [G. nystagmos, a nodding … Medical dictionary
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