Weiss ring: a large, ring shaped floater that is sometimes seen if the vitreous body releases from the back of the eye When this occurs there is a characteristic pattern of symptoms: * Flashes of light (photopsia) * A sudden dramatic increase in the number of floaters * A ring of floaters or hairs just to the temporal side of the central vision As a<unk>  proceeds, adherent vitreous membrane may pull on the retina. While there are no pain fibers in the retina, vitreous traction may stimulate the retina, with resultant flashes that can look like a perfect circle. If a retinal vessel is torn, the leakage of blood into the vitreous cavity is often perceived as a "shower" of floaters. Retinal vessels may tear in association with a retinal tear, or occasionally without the retina being torn. A Weiss ring can sometimes be seen with ophthalmoscopy as very strong indicator that vitreous<unk>  has occurred. This ring can remain free-floating for years after<unk> . Complications The risk of retinal<unk>  is the greatest in the first 6 weeks following a vitreous<unk> , but can occur over 3 months after the event. The risk of retinal tears and<unk>  associated with vitreous<unk>  is higher in patients with myopic retinal degeneration, lattice degeneration, and a familial or personal history of previous retinal tears/detachment.
Posterior vitreous detachment
Ischemic optic neuropathy
Vitreous hemorrhage
Posterior ischemic optic neuropathy
Anterior ischemic optic neuropathy
Arteritic anterior ischemic optic neuropathy
Acute retinal necrosis
Optic neuritis