Researchers report they have genetically mapped the cell types that make up the mouse iris -- the thin disc of pigmented tissue that, in humans, gives eyes their distinct colors. Johns Hopkins ...

The iris is the colored part of the eye that helps control how much light enters the eye. Some health conditions of the iris can cause the pupils to be different sizes or cause the iris to be ...

Johns Hopkins Medicine researchers report they have genetically mapped the cell types that make up the mouse iris — the thin disc of pigmented tissue that, in humans, gives eyes their distinct colors.

The pupils of domestic cats’ eyes are ovoid, but those of big cats such as lions and leopards are round like human pupils. Why is this and do the differences confer any advantage either way? • In ...

Johns Hopkins Medicine researchers report they have genetically mapped the cell types that make up the mouse iris — the thin disc of pigmented tissue that, in humans, gives eyes their distinct colors.