Marcus Gunn pupil or relative afferent pupillary defect (RAPD) 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.
The most common cause of Marcus Gunn pupil is a lesion of the optic nerve (between the retina and the optic chiasm) or severe retinal disease. It is named after Scottish ophthalmologist Robert Marcus Gunn.
Other articles related to "marcus gunn pupil, pupils, pupil, gunn, marcus gunn":
... The Marcus Gunn pupil is a relative afferent pupillary defect indicating a decreased pupillary response to light in the affected eye ... response would be equal constriction of both pupils, regardless of which eye the light is directed at ... eye will cause only mild constriction of both pupils (due to decreased response to light from the afferent defect), while light in the unaffected eye will cause a normal constriction of both pupils (due ...
... urine A Adie pupil William John Adie neurology ciliary nerve damage dilated pupil, poorly reactive but with normal near accommodation A Adson's sign ... Graves' ophthalmopathy (needed) lid lag of the lower eyelid on upward eye movement G Gunn's sign Robert Marcus Gunn ophthalmology hypertension Gunn's sign at Who Named It? AV "nicking" or "nipping" in ... reflection centred (-) or not centred (+) on pupil H Hoffmann's sign Johann Hoffmann neurology corticospinal tract lesions tapping distal phalanx of 3rd or 4th finger elicits flexion of same ...
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