what part of the eye regulates the amount of light coming in
1 Light passes through the cornea, the clear, dome-shaped surface that covers the front of the eye. 2  The cornea bends-or refracts-this incoming light. 3  The iris, the colored part of the eye, regulates the size of the pupil, the opening that controls the amount of light that enters the eye.
The part of the eye that narrows and widens to control the amount  of light that enters our eye is called the pupil.