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A 28-year-old male asked:

What is the definition or description of: pupil?

1 doctor answer3 doctors weighed in
Dr. Richard Bensinger
Ophthalmology 53 years experience
Eye window: 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.

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Last updated Aug 20, 2015

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