Final answer:
The aqueous humor is a fluid secreted by the ciliary processes, and it is vital for maintaining eye pressure and providing nutrients to eye structures.
Step-by-step explanation:
The aqueous humor is a fluid secreted by the ciliary processes. It fills the anterior chamber of the eye, which contains the cornea, iris, ciliary body, and lens. The function of the aqueous humor is to maintain intraocular pressure, provide nutrients to the avascular structures of the eye, and remove metabolic waste. The aqueous fluid is constantly produced and drained to keep the eye's pressure constant. In contrast, the vitreous humor is a viscous fluid that fills the posterior chamber of the eye and is not involved in the secretion of the aqueous humor.