There are over 300 different species of irises. Here are ten of the most popular types of iris, and some of their ...

Heterochromia refers to a harmless genetic anomaly resulting from an uneven distribution of pigment within one or both eyes.

That coloured circle is called the iris and the black spot in the middle is the pupil. This is the part of the eye that lets the light in. Lights out please! When it’s dark, muscles in the iris ...