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Dilated pupil

Dilated pupil

C015/1973

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Dilated pupil. Enhanced image of a dilated pupil. The iris, a coloured muscular ring, regulates the amount of light that enters the eye through the pupil (black). Low light conditions, sexual arousal and certain drugs can cause the pupil to dilate (enlarge).

Release details

Model release not required. Property release not required.

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