The vitreous humour is a transparent and colorless gel located between the retina and the lens. In posterior vitreous detachment (PVD), the vitreous membrane (which surrounds the vitreous humor) separates from the retina. This condition is common in individuals over 65 years of age but may occur in younger persons. PVD is often characterized by flashes of light and floaters, and may be complicated by retinal detachment.