Posterior vitreous detachment (PVD ... If the floaters appear in the shape of a circle or oval, this is called a Weiss ring. The other sign of PVD is flashes of light in your peripheral vision.

which can result in fibrillary opacities or even a Weiss ring. Most of these patients who complain of symptoms consistent with vitreous opacities will have a posterior vitreous detachment ...