Which part is NOT a component of the uveal tract?

The uveal tract is a key part of the eye and is composed of three main structures: the iris, the ciliary body, and the choroid. Each of these components plays a vital role in the overall function of the eye. The iris is responsible for regulating the amount of light that enters the eye by controlling the size of the pupil. The ciliary body is essential for processes such as producing aqueous humor and controlling the shape of the lens for focusing. The choroid, located between the retina and the sclera, is rich in blood vessels and nourishes the outer layers of the retina.

The cornea, on the other hand, is not part of the uveal tract. It is a transparent, dome-shaped structure located at the front of the eye and serves as the eye's primary lens system, focusing light onto the retina. The cornea is composed of five layers and is essential for clear vision, but it does not have the same vascular structure or function as the components of the uveal tract. This distinction helps clarify that the correct answer is the cornea, as it does not belong to the uveal tract.