What is the vitreous body?
Vitreous body is a gel located in the posterior part of the eye, in the space between the crystalline lens (which is removed in cataract surgery) and the retina (the inner layer in which the image is focused and is transferred to the brain).
The gel of the vitreous body is transparent and consists mostly of water (98%), but it also contains collagen, sugars and salt. The role of the transparency is to allow the light to reach the retina.
What is the posterior vitreous detachment?
The vitreous body of young children, as well as adolescents is compact and is strongly attached to the retina. As part of the natural aging is usual for the components of the vitreous body to degenerate. In particular the vitreous body becomes watery and is detached on its own from the retina. This condition is called posterior vitreous detachment.