Pan retinal photocoagulation, also called PRP, is a type of laser that treats proliferative diabetic retinopathy. The laser treats the peripheral retina affected by diabetes. However, the macula is never treated. The laser causes the abnormal vessels to shrink and scar thereby preventing them from returning. After treatment, your peripheral vision will become more limited and your night vision will be a little worse. Immediately after treatment, your central vision maybe a little blurry, but this will gradually improve. With regular check-ups and a healthy lifestyle, the threat of sight loss from diabetic retinopathy is greatly reduced.