A m e r i c a' s   H e a l t h   S e a r c h   E n g i n e Pharmacology, and Medical Terminology Lookup

Definition of Iris Iris: The iris is the circular, colored curtain of the eye. Its opening forms the pupil. The iris helps regulate the amount of light that enters the eye. The eye has a number of other key components. These include the cornea, pupil, lens, retina, macula, optic nerve and vitreous.

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