Your eye is a slightly asymmetrical globe, about an inch in diameter. The front part (what you see in the mirror) includes: Just behind the iris and pupil lies the lens, which helps focus light on ...

The colored part of the eye surrounding the pupil is called the iris. It automatically regulates the amount of light entering the eyes by regulating the size of the pupil. Light is the primary ...

By keeping the bulb in the center and orbiting the blue gel (for the iris) and the opaque disk (for the pupil) around the bulb, the eye can appear to gaze in different directions. By adjusting the ...

Coloboma: This happens when part of your eye doesn’t form the right way before you’re born. A coloboma in the iris usually leads to the pupil being longer than it should be, sometimes giving ...

But instead of affecting the area around the pupil, segmental heterochromia affects a larger portion of the iris. It can occur in one or both eyes. Read on to learn how this condition differs from ...

The iris has an adjustable circular opening called the pupil, which can expand or contract to control the amount of light entering the eye, Fromer said. Ciliary muscles surround the lens.