Down beat nystagmus.
D000293:Adolescent; D000328:Adult; D002493:Central Nervous System Diseases / Q000150:complications / Q000175:diagnosis; D005132:Eye Manifestations; D006801:Humans; D008297:Male; D009759:Nystagmus, Pathologic / Q000209:etiology*; D010985:Platybasia / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D011859:Radiography; D012886:Skull / Q000000981:diagnostic imaging