Choroid of the eye
The thin vascular middle layer of the eye that is situated between the sclera (the white of the eye) and the retina (the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain). The choroid is part of the uvea, which also comprises the iris (the circular, colored curtain of the eye that surrounds the pupil) and the ciliary body (tissue that connects the iris with the choroid and includes a group of muscles which act on the lens of the eye to change its shape).

Medical dictionary. 2011.

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