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Definition of Nystagmus

Nystagmus: Rapid, rhythmic, repetitious, and involuntary eye movements. Nystagmus can be horizontal, vertical, or rotary. Whatever form it takes, nystagmus is an abnormal eye finding and a sign of disease within the eye or the nervous system.

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 3/19/2012

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