Downbeat Nystagmus

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"A downbeat nystagmus was present in center gaze in this man who probably had an infarction in the cerebellum. The amplitude is increased in lateral gaze. The patient noted vertical oscillopsia in lateral gaze due to the increase in size of the downbeat nystagmus. The amplitude of the nystagmus decreased in upgaze. The nystagmus was present in downgaze. The effect of vertical gaze is variable among patients for as downbeat nystagmus is almost always increased by lateral gaze."
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