Pupil
Central opening of the iris through which rays of light enter the eye. The diameter depends on ambient light. An opening in the center of the iris, of variable sizes, that regulates the amount of light that enters the eye.
Related Links
Pupil – Definition and Detailed Illustration
Pupil (eye) – Simple English Wikipedia, the free encyclopedia
What is the Pupil of the Eye? – Definition & Function – Video & Lesson Transcript — Study.com
Why Are My Pupils Dilated? 5 Causes of Dilated Pupils (Mydriasis)
Dilated Pupils: 10 Messages My Eyes are Sending You
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