Vascular tunic

Definition

The vascular tunic, also known as the uvea, is the middle layer of the eye that contains most of the eye's blood vessels. It is responsible for providing oxygen and nutrients to the eye tissues and consists of the iris, ciliary body, and choroid.

Related terms

Iris:

The colored part of the eye that controls the diameter and size of the pupil and thus determines how much light enters the eye.

Ciliary Body: A structure in the eye that releases a fluid called aqueous humor into the eye and helps change the shape of the lens for focusing.

Choroid:

A layer of blood vessels between the retina and sclera that provides oxygen and nutrients to the outer layers of the retina