"Miosis" is a medical term that describes the constriction of the pupils. Learn its causes, symptoms, and how to treat it.

Permanently changing your eye color isn't something you can readily do, but our ophthalmologist explains that there are four ...

Muscles in the colored part of your eye, your iris, then work to constrict or dilate your pupils, letting in more or less light as needed. 2. Medication "Certain medications can interfere with the ...

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

Like most human traits, blue eyes are determined by genes, and no two people have exactly the same hue. It works a lot like ...