Gaze-Evoked Phenomena

Gaze-Evoked Phenomena

A variety of symptoms have been reported to be evoked, on occasion, by alteration of the direction of gaze:

  1. Amaurosis: lesion, usually intraorbital, compressing central retinal artery
  2. Laughter
  3. Nystagmus: usually indicative of cerebellar lesion; may occur as a side-effect of medications; also convergence-retraction nystagmus on upgaze in dorsal midbrain (Parinaud’s) syndrome
  4. Phosphenes: increased mechanosensitivity in demyelinated optic nerve
  5. Segmental constriction of the pupil (Czarnecki’s sign) following aberrant regeneration of the oculomotor (III) nerve to the iris sphincter
  6. Tinnitus: may develop after resection of cerebellopontine angle tumors, may be due to abnormal interaction between vestibular and cochlear nuclei
  7. Vertigo


Cross References

Leopold NA. Gaze-induced laughter. Journal of Neurology,Neurosurgery and Psychiatry 1977; 40: 815-817