Posterior vitreous detachment (PVD) The vitreous The vitreous is clear jelly-like substance filling the cavity of the eye. It lies directly in front of the retina (the nerve tissue lining the back of the eye). With age, the vitreous jelly degenerates and liquefies, developing pockets of water. This may cause the vitreous to collapse and … Continue reading Posterior vitreous detachment (PVD)