[Rebound nystagmus in normal subjects].
Rebound nystagmus represents a disorder of ocular movement in patients with cerebellar lesions. It was reported, however, that it occurred in normal subjects in darkness. Jerk nystagmus, amplitude of 0.5-2 deg and frequency of less than 2Hz, was evoked after prolonged eccentric fixation and fatigue within about 5 to 15 seconds in 7 normal subjects of the experiment. The nystagmus increased depending on the eccentricity and duration of gaze holding. It also depended on the orbital position 10deg left, 0 deg, 10 deg right after eccentric gaze. It is suggested that rebound nystagmus resulted from the leaky neural integrator of the brainstem, and a shift of the null position in the direction of the eccentric gaze. These two components may cause different types of nystagmus by various combinations.
Suzuki
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Department of Ophthalmology, Koshigaya Hospital, Dokkyo University School of Medicine, Japan.
D000328:Adult; D004585:Electrooculography; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008297:Male; D009760:Nystagmus, Physiologic / Q000502:physiology*; D013997:Time Factors