What is the main function of the ciliary body?

The main function of the ciliary body is to control the shape of the lens, which is essential for the process of accommodation. Accommodation allows the lens to change shape in order to focus on objects at various distances. When the ciliary muscles contract, they reduce the tension on the zonules (the fibers connecting the ciliary body to the lens), allowing the lens to become more rounded for near vision. Conversely, when the ciliary muscles relax, the tension increases, flattening the lens for distance vision. This dynamic adjustment is crucial for clear vision as it enables the eye to focus on both near and far objects effectively.

The other choices don't accurately represent the primary function of the ciliary body. Reflecting light involves structures like the cornea and retina, anchoring the retina is primarily the role of the retinal pigment epithelium and surrounding structures, and absorption of excess moisture typically relates to the functions of glands around the eye, rather than the ciliary body itself.