The "Swinging Flashlight Test:" What Your Eye Doctor is Looking ForWhen the doctor shines a light in your eye, then alternates between eyes, what is he looking for? The doctor is commonly looking for the Marcus Gunn Pupil. What's that?
What is a Marcus Gunn Pupil?
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The Marcus Gunn Sign is a measurement of how the pupils in the eye react to a swinging light. When a bright light is swung from one eye to another, the pupil of the affected eye will constrict less. The Marcus Gunn Signs is also known as Relative Afferent Pupillary Defect.