Medically reviewed by Johnstone M. Kim, MD The iris is the colored part of the eye that controls the amount of light that enters into the eye. It is the most visible part of the eye. The iris lies in ...

Learn about the anatomy of your eyes and how each part of the eye works in order to create visual output.

Human eyes are actually spheres. The part that we can see is only just the front. That coloured circle is called the iris… and the black spot in the middle is the pupil. This is the part of the ...