What are the main components of the uvea?

The uvea is a critical component of the eye, consisting of three primary structures: the iris, ciliary body, and choroid. Each of these parts plays a vital role in the eye’s function and overall health.

The iris is the colored part of the eye that controls the size of the pupil and, consequently, the amount of light that enters the eye. The ciliary body, located behind the iris, produces aqueous humor and contains the muscles that adjust the lens for focusing. The choroid is a vascular layer located between the retina and sclera, providing nourishment to the outer layers of the retina and helping absorb excess light to prevent scattering within the eye.

This option clearly identifies the uvea, which is often referred to as the middle layer of the eye and is essential for vision through its roles in regulating light entry and maintaining eye health. Understanding these components is crucial for grasping how the eye functions and responds to various stimuli.