<prompt> Proliferative diabetic retinopathy is treated byPan retinal photocoagulationPars plana vitrectomyGrid laser photocoagulationFocal retinal photocoagulation  <response>: Panretinal photocoagulation PRP is the preferred form of treatment of proliferative diabetic retinopathyPDR. ... In cases where macular edema and PDR coexist, laser treatments are performed: first, laser treatment is used for the macular edema; then for PDR, the PRP is spread over 3 to 4 sessions Ref AK khurana 6e p278 