What is the role of the ciliary body in the eye?

The ciliary body plays a crucial role in the eye by supporting the iris and adjusting the lens. This structure is also responsible for producing the aqueous humor, which is the fluid that fills the front part of the eye. The ciliary body consists of muscles that alter the shape of the lens, allowing for changes in focus between distant and near objects—a process known as accommodation. This ability to adjust the lens is essential for maintaining clear vision at various distances.

While the ciliary body does have additional functions, such as fluid production, its primary role in lens adjustment and support of the iris makes it essential for proper visual function. The other options refer to functions that are associated with different parts of the eye, such as protecting the retina or connecting to the brain, highlighting the specific, vital functions the ciliary body performs in overall ocular health and vision.