Verywell Health on MSN

Iris: Anatomy, Function, and Associated Conditions

Medically reviewed by Michael Menna, DO Key Takeaways The iris is the colored part of the eye that helps control how much ...
La Crosse Tribune

Ask Your Science Teacher: What causes eyes to change color?

Pigmentation of the iris in humans varies depending on the amount of melanin, a natural pigment, located in the back of the iris. Most babies of European ancestry have light colored, or blue eyes, at ...