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The main functions of the vitreous are to transmit light to the retina, and to exert enough pressure to keep the retinal layers tightly pressed together. This pressure helps maintain the round shape of the eye so the lens can focus sharp images on the retina. The vitreous is very different from the aqueous humor.
Support. 1  Posterior vitreous detachment (PVD) is a very common eye condition. It's caused by natural changes to the vitreous gel which takes up the space inside the eye. 2  Although PVD causes some frustrating symptoms it doesnât cause pain, harm the eye or cause permanent loss of vision.