What does a iris do in eye?

The iris is a colored, muscular part of the eye that controls the size of the pupil. The pupil is the black hole in the center of the iris. The iris is made up of two sets of muscles: the dilator pupillae and the sphincter pupillae. The dilator pupillae muscle widens the pupil, while the sphincter pupillae muscle narrows the pupil.

The size of the pupil is controlled by the amount of light that is entering the eye. In bright light, the pupil is small, which helps to protect the retina from damage. In dim light, the pupil is large, which allows more light to enter the eye and helps us to see better.

The iris also gives our eyes their color. The color of the iris is determined by the amount of melanin in the iris. Melanin is a pigment that is also responsible for the color of our skin and hair.

The iris is an important part of the eye that helps us to see clearly and protect our eyes from damage.