Question

Name the process/ term for the following statements:

A part of human eye which controls the amount of light entering into it.

Answer 1

Iris:

1. It is the colored portion of the eye which has an aperture called pupil in the center through which light enters the eye.
2. The size of the aperture is controlled by the circular and radial muscles of the iris.
3. The dilation of the pupil is done by the radial muscles of the iris.
4. The narrowing of the pupil is carried out by the circular muscles of the iris.