Congenital Nystagmus; A Clinical Study of 28 Patients.

Congenital nystagmus can be divided into five types : jerky, pendular, pendular-jerky, latent and periodic alternating. We examined 28 patients with congenital nystagmus from 1987 to 1992 and analysed the results of ENGs recorded with eyes open, eyes closed, eyes open in the dark and during eye tracking and optokinetic pattern testing. Eleven patients had jerky, 6 had pendular, 8 had pendular-jerky, 2 had latent, and 1 had periodic alternating nystagmus.