Question

what is mean by iris and its function

Answer 1

In humans and most mammals and birds, the iris (plural: irides oririses) is a thin, circular structure inthe eye, responsible for controllingthe diameter and size of the pupil and thus the amount of light reaching the retina. Eye color isdefined by that of the iris.

Answer 2

The iris of a human eye is the colored ring between the clear cornea on the outside and the crystalline lens on the inside. In the middle of the iris is the opening called the pupil. ... Smooth muscles of the iris constrict and dilate the pupil to regulate the amount of light that gets into the back portions of the eye

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