Tears or holes in the retina. These may lead to retinal detachment by allowing fluid from the middle of the eye (vitreous gel) to collect under the retina. A common cause of retinal tears is posterior vitreous detachment (PVD). An eye or head injury or other eye disorders, such as lattice degeneration, a condition in which the retina becomes very thin, may also cause tears or holes in the retina.
Fluid buildup under the retina. Fluid buildup under the retina can cause the retina to come off the back of the eye. Fluid buildup may be caused by inflammation or disease in the retina, in the layer just beneath the retina (choroid), in blood vessels, or in tissues in the eye.