Marcus Gunn pupil

Marcus Gunn pupil (relative afferent pupillary defect) is a medical sign observed during the swinging-flashlight test whereupon the patient's pupils constrict less (therefore appearing to dilate) when a bright light is swung from the unaffected eye to the affected eye. The affected eye still senses the light and produces pupillary sphincter constriction to some degree, albeit reduced.

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• Marcus Gunn
• pupil
• ophthalmology
• pupilla
• oftalmologia
• occhio
• oculista
• norb