Epileptic gaze deviation and nystagmus.

We studied a patient with stereotyped focal seizures characterized by leftward conjugate eye- and head-turning followed by nystagmus. Eye deviation was associated with the appearance of seizure activity, recorded over the right temporo-occipital scalp, that did not spread frontally. The initial eye deviation consisted of a staircase of small saccades. The subsequent nystagmus showed rightward decreasing-velocity exponential slow phases and normal leftward quick phases. Saccadic eye movements due to seizures may occur via projections from posterior cortical areas as well as from the frontal eye fields.