it is known as Iris. contraction or relaxation of iris alters the size of pupil.
The color ring of muscle that controls the size of the pupil is called the iris. It can expand or contract to regulate the amount of light entering the eye.
The structure which is most prominent in the eyeball, surrounding the pupil is the "IRIS". It gives the eye its color and helps in dilating and constricting the pupil.
The color of your eye is called the color of your eye.DUMMY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The dilator muscle which makes the pupil larger and the constrictor muscle which makes the pupil smaller.
Eye trauma can damage the muscle that controls pupil size.
Umm probably the pupil if you mean like, the white, color pupil or if you mean something else but if you mean white color pupil then pupil :) hope it helped
The iris is the structure in the eye that gives it color. It is a thin, circular structure that controls the size of the pupil and regulates the amount of light that enters the eye. The amount of pigment in the iris determines the color of the eye.
iris
The smooth muscle in the iris of the eye controls the size of the pupil, which regulates the amount of light entering the eye. When this muscle contracts, the pupil constricts, reducing the amount of light that enters the eye, and when it relaxes, the pupil dilates to allow more light in.
The iris is a muscle that adjusts to allow more or less light into the pupil.
The size of the pupil in the human eye is controlled by the iris, which is a ring of muscle that can expand or contract to adjust the size of the pupil.
it squishes it until it becomes so small that the naked eye can't see it. (he he he) (naked)