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

Study shows pupil size and iris brightness affect how others perceive your attractiveness, friendliness, and generosity.

It affects the iris, at the front of your eye ... This affects your ciliary body and the gel that fills your eye. This type might not be noticeable to others but affects how well you see.

You might have an operation to remove certain types of eye cancer. For example ... Or, for small melanomas of the iris, you might have one of the following: Your doctor may recommend surgery to remove ...

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 ...

There are three different types of cone cells which produce colour vision. The amount of light entering the eye is controlled ... by the muscles of the iris.