Question

write about importance of iris in human eye

Answer 1

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he pupil, which looks black because of the heavily pigmented back of theeye, changes size to control and regulate the amount of light passing through the lens to reach the retina.

Answer 2

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