Marcus gunns sign

Marcus gunns sign --> gunns sign

(Science: clinical sign) compression of the underlying vein at arteriovenous crossings seen ophthalmoscopically in arteriolar sclerosis, 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: marcus gunns sign.

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