What is the Uvea and What Parts of the Eye are Most Affected by Uveitis?
The uvea is the middle layer of the eye which contains much of the eye’s blood vessels (see diagram). This is one way that inflammatory cells can enter the eye. Located between the sclera, the eye’s white outer coat, and the inner layer of the eye, called the retina, the uvea consists of the iris, ciliary body, and choroid:
Iris: The colored circle at the front of the eye. It defines eye color, secretes nutrients to keep the lens healthy, and controls the amount of light that enters the eye by adjusting the size of the pupil.
Ciliary Body: It is located between the iris and the choroid. It helps the eye focus by controlling the shape of the lens and it provides nutrients to keep the lens healthy.
Choroid: A thin, spongy network of blood vessels, which primarily provides nutrients to the retina.
Uveitis disrupts vision by primarily causing problems with the lens, retina, optic nerve, and vitreous (see diagram):
Lens: Transparent tissue that allows light into the eye.
Retina: The layer of cells on the back, inside part of the eye that converts light into electrical signals sent to the brain.
Optic Nerve: A bundle of nerve fibers that transmits electrical signals from the retina to the brain.
Vitreous: The fluid filled space inside the eye.READ MORE