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Gaze-Evoked Phenomena

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

Amaurosis: lesion, usually intraorbital, compressing central retinal artery
Laughter
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
Phosphenes: increased mechanosensitivity in demyelinated optic nerve
Segmental constriction of the pupil (Czarnecki’s sign) following aberrant regeneration of the oculomotor (III) nerve to the iris sphincter
Tinnitus: may develop after resection of cerebellopontine angle tumors, may be due to abnormal interaction between vestibular and cochlear nuclei
Vertigo