Nystagmus: a clinical review.

A review of different types of nystagmus is presented. The review includes characteristic features of the history and findings on examination of nystagmus which allow classification. Types of nystagmus reviewed include congenital, acquired pendular, acquired jerk nystagmus, special nystagmus types such as periodic alternating and downbeat, and the related ocular oscillations such as ocular myoclonus and superior oblique myokymia.