Diagnosis of early Parkinson's disease.
D000328:Adult; D000368:Aged; D005132:Eye Manifestations; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009460:Neurologic Examination; D009759:Nystagmus, Pathologic / Q000209:etiology; D010300:Parkinson Disease / Q000175:diagnosis*