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Contracted pupil

Contracted pupil

P420/0539

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Credit

BSIP, CHASSENET / SCIENCE PHOTO LIBRARY BSIP, CHASSENET / SCIENCE PHOTO LIBRARY

Caption

Contracted pupil. Man with a contracted (shrunken) pupil. This effect, called miosis, is a normal response to bright lighting. The smaller aperture prevents too much light from entering the eye, improving depth of focus but reducing sensitivity. It also occurs in response to the use of narcotics, such as heroin. For the same eye with a dilated pupil, see P420/538.

Release details

Model release not required. Property release not required.

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