Posterior vitreous detachment

Posterior vitreous detachment (PVD) refers to the separation of the posterior vitreous cortex from the inner surface of the retina, and is a common cause of retinal tears. The main cause of PVD is the age-related shrinkage of the vitreous gel, which gradually detaches from the retina. The main symptom of PVD is floaters, which are small black spots moving in the field of vision.