Marcus Gunn pupil

noun

A pupil of the eye that exhibits unusually little constriction when a bright light is swung from the unaffected eye to the affected eye. It can be caused by a lesion of the optic nerve.

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Meanings

nounMarcus Gunn pupil (plural Marcus Gunn pupils)

plural Marcus Gunn pupils

  1. A pupil of the eye that exhibits unusually little constriction when a bright light is swung from the unaffected eye to the affected eye. It can be caused by a lesion of the optic nerve.

Origin

Named after Scottish ophthalmologist Robert Marcus Gunn.

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Cite this entry
APA

Marcus Gunn pupil. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/Marcus%20Gunn%20pupil

MLA

“Marcus Gunn pupil.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Marcus%20Gunn%20pupil. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “Marcus Gunn pupil,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/Marcus%20Gunn%20pupil.

Source: Marcus Gunn pupil on Wiktionary, CC BY-SA 4.0.