A 23 year old male, college student, who had spontaneous nystagmus since childhood began to experience a vertiginous and heavy head sensation after accidental head trauma (followed by 6 hours of unconsciousness, yet there were no notable objective residual signs in neurosurgical examination shortly after awakening from the unconscious state).
Otoneurological examinations revealed :
1) a horizontal pendular nystagmus when he gazed forward
2) An elder brother has a similar spontaneous nystagmus.
3) Head shaking, like a nystagmic head movement.
4) Inversion phenomenon appeared dominantly on the right Optokinetic Pattern Test.
5) Alternate nystagmus, even when gazing forward.
6) No notable cessation or reduction of nystagmus beats when he closed his eyes or when his eyes were covered; and
7) Some reduction in visual acuity.
