Pupil

Definition (http://en.wikipedia.org/wiki/Pupil)

The pupil is a hole located in the center of the iris of the eye that allows light to enter the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil. In humans the pupil is round, but other species, such as some cats, have vertical slit pupils, goats have horizontally oriented pupils, and some catfish have annular types. (Wikipedia)

Preferred Units: N/A

Scope Note:
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This term is used for the following terms: 
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Approved Date
05-Apr-2013

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