What is the primary function of the uvea in the eye?

The uvea serves as the vascular tunic layer of the eye, which includes the iris, ciliary body, and choroid. Its primary function is to supply blood to the eye, providing essential nutrients and oxygen to the retina and other structures. This rich vascularization is crucial for maintaining the health of the eye and supporting its various functions. The uvea also plays a role in controlling light entry through the pupil via the iris and is involved in focusing mechanisms through the ciliary body. By being the vascular layer, the uvea is integral to maintaining the overall integrity and functionality of the ocular system.

The protective outer layer and light-capturing structure refer more specifically to the sclera and retina, respectively. The connection between the lens and retina is facilitated by the vitreous body, and not primarily by the uvea itself. Understanding these distinctions helps clarify the specific role of the uvea within the anatomy of the eye.