PVS (Posterior Vitreous Separation) is a natural process that occurs in the eye as people age. The vitreous is a gel-like substance that fills the inside of the eye and is attached to the retina. As a person ages, the vitreous can shrink and pull away from the retina, causing PVS. This process is usually harmless and does not cause any vision problems. However, in some cases, PVS can lead to the development of floaters or flashes of light in the vision. If you experience sudden onset of floaters or flashes of light, it is important to see an eye doctor as soon as possible, as these can be symptoms of a more serious condition such as a retinal tear or detachment.