Vitreous Humor

The vitreous humor is the transparent gel that fills the eyeball between the retina and the lens. It contains mostly phagocytes cells which remove unwanted cellular debris in the visual field, as well as the hyalocytes of Balazs, which reprocess the hyaluronic acid. It has no blood vessels as 99% of its volume is water with salts, sugars, vitrosin, and a network of collagen type II fibers with the mucopolysaccharide hyaluronic acid accounting for the rest.

The vitreous is in contact with the retina and helps to keep it in place by pressing it against the choroid, but it does not adhere to the retina, except in three places: around the anterior border of the retina; in the macula, the tiny spot in the retina which gives us our "detail" and central vision; and at the optic nerve disc.