Abstract
A 22-year-old woman complained of dizziness with vomiting of 6 months duration. She had a characteristic nystagmus which was the combined type of pendular and jerky waves. Nystagmus imposition in ETT and suppression of fast phase in OKP were observed. In OKN with superimposed method, inversion on slow phase was clearly demonstrated.
Spontaneous nystagmus, ETT and OKP were detected in her 25yr. old brother.
The incidence of congenital nystagmus in families and the usefulness of superimposed method for OKN involvements were discussed.
