What is a Pupil?

The pupil is the opening or hole in the center of the iris (the structure that gives our eyes their color). The function of the pupil is to allow light to enter the eye so it can be focused on the retina to begin the process of sight. Typically, the pupils appear...

How Eye Color Works

Human eye color comes from melanin, the same compound that determines skin and hair color. Melanin absorbs light, even some UV light, which is important for the iris — the part of the eye that controls how much light enters the pupil. Melanin and Pigment Types There...