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Medical Term:

Gunn sign

Pronunciation: gun


  1. compression of the underlying vein at arteriovenous crossings seen ophthalmoscopically in arteriolar sclerosis;
  2. on alternate stimulation with light, the pupil of an eye with optic nerve transmission defect constricts poorly or even dilates when stimulated (a relative afferent pupillary defect).

Synonym(s): Gunn crossing sign

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.