Abstract
Spontaneous nystagmus when obvious and well marked is a useful indicator of disturbed oculomotor control. Not all cases are due to vestibular disturbance. Some causes are enumerated including congenital, cerebellar and vestibular lesions. Recording artifacts must be excluded. Positioning nystagmus can be physiological. When onset of the nystagmus is delayed or the duration persists considerably beyond completion of the positioning, then the term positional nystagmus is used. Various types and some possible causative mechanisms are briefly mentioned.
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