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Other Topics›Pupil

Pupil

The pupil is the opening in the iris inside of the eye though which light is focused on the retinal film at the back of the eye. The iris can open and close in response to light to vary the amount inside the eye. It is what looks red, in the "red eye" in photographs.
Dr. Richard Bensinger
Dr. Richard Bensingerreviewed this
Ophthalmology 54 years experience
How long it usually lasts:

Chronic (lasts years to lifelong)

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