The choroid, shown here in bright red, lies between the retina and sclera. The choroid is a soft, thin, brown, extremely vascular layer, lining the inner surface of the sclera. It is composed of layers of blood vessels that nourish the back of the eye. The choroid connects with the ciliary body toward the front of the eye and is attached to edges of the optic nerve at the back of the eye. The principal function of the choroid lies in the blood nourishment of the outer layers of the retina. The choroid is part of the uvea. Inflammation in this layer of the eye is called choroiditis.


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