There are some things you'd rather not see. Like whatever just squished under your shoe while walking in the park. Or when ...

Iris nevus: In the colored part of your eye; Choroidal nevus: Under your retina (in back of your eye) Nevi can be yellow, brown, gray, or a combination of colors.

Damage to the light-detecting cells of the retina is irreversible and causes blindness. In November 12 online Nature Neuroscience Masatoshi Haruta and colleagues from Kyoto University, Japan show that ...

A coloboma is when tissue is missing from the eye. Learn about the causes, symptoms, ... The uvea is the middle layer of the eye, made up of the iris, choroid, and ciliary body.

Learn about the human eye and how our sight works with 2nd level Science on Bitesize. ... Iris - Coloured circle around the pupil. It controls the size of the pupil.