With the normal process of aging, the vitreous humor may begin to shrink due to a decrease in viscosity or thickness. This process is called vitreous degeneration. As the fluid changes from a thick gel-like substance to a thinner liquid consistency, the vitreous humor separates from the retina. This can lead to vitreous floaters, or small disruptions in the visual field such as spots, web-like lines, or rings. No specific treatment is needed in most cases, as the floaters tend to become less noticeable over time. However, serious complications can occur, so it is recommended to consult a physician.  In some cases, significant vitreous degeneration can lead to detachment of the vitreous humor from the retina, known as a posterior vitreous detachment (PVD). This can lead to flashes of light and a significant increase in floaters. PVD can also cause blood vessels to stretch and tear, potentially leading to a vitreous hemorrhage. Moreover, posterior vitreous detachment causes traction on the retina, which can lead to several complications such as a retinal tear, retinal detachment, or macular hole.  A retinal tear can occur when the lining of the back of the eye (the retina) is torn as a result of the vitreous pulling away from the eye. If not treated promptly, a retinal tear can lead to retinal detachment, which is a medical emergency that requires surgery. Retinal detachment will typically present as photopsia (AKA flashes of light in the visual field), blurred vision, reduced peripheral vision, and the sudden appearance of a large number of floaters. If left untreated, retinal detachment can lead to permanent vision loss in the affected eye. In some cases, the macula can also tear when the vitreous pulls away from the retina, causing a small hole. A macular hole will usually result in blurred or distorted vision.