Proliferative vitreoretinopathy (PVR) occurs when scar tissue forms on top of or under the retina after retinal detachment, which prevents the retina from falling back into place, and reattaching. PVR can happen in retinal detachment cases either before or after surgery. PVR is uncommon, occurring in about 5-10% of retinal detachments. However, when PVR does occur after surgery, it is the most common reason for a retinal detachment surgery to fail.
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