As we age, the vitreous inside the eye tends to shrink and may eventually separate from the inside surface of the eye. This is called a posterior vitreous detachment or PVD. When the vitreous pulls free from the eye, it is often accompanied by flashes of light and the appearance of tiny black spots in the vision. In general PVDs are not dangerous, but in certain cases they can lead to more serious conditions. If left untreated, these conditions can lead to vision loss and may also lead to blindness. It is suggested that anyone with symptoms of a posterior vitreous detachment should have an eye examination immediately to make sure that a more serious problem is not present.