Relaxation of the ciliary muscle puts tension on these fibers and changes the shape of the lens in order to focus light on the retina.

The inner layer is transparent and covers the vitreous body, and is continuous from the neural tissue of the retina.

[5] The parasympathetic tone is dominant when a higher degree of accommodation of the lens is required, such as reading a book.

Accommodation essentially means that when the ciliary muscle contracts, the lens becomes more convex, generally improving the focus for closer objects.

Approximately 80% of aqueous humor production is carried out through active secretion mechanisms (the Na+K+ATPase enzyme creating an osmotic gradient for the passage of water into the posterior chamber) and twenty percent is produced through the ultrafiltration of plasma.

Because the ciliary body produces aqueous humor, it is the main target of many medications against glaucoma.

Its inhibition leads to the lowering of aqueous humor production and causes a subsequent drop in the intraocular pressure.