Tokay Geckos are known for their bright blue or gray bodies with orange or red spots ... often seen coiled around tree branches. Its eyes are large, with a vertical slit for a pupil.

Flash photos typically produce a red reflection in people’s eyes, but sometimes that reflection can appear white or gray, ...

The uvea, one layer of your eye’s walls, includes three parts: Iris, the colored ring around your pupil that’s visible on the front of your eye Ciliary body, a muscle beyond your iris that ...

In this video, learn about different parts of the human eye and ... iris make the pupil grow bigger, which means it can let in more light. And when there’s lots of light around, it shrinks.