Answer:
Iris is the part of eye that is colored and responsible for controlling the amount of light entering into the eye
Iris control the size of pupil regulating the light that researchers the retina
Explanation:
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.
