Proliferative diabetic retinopathy is treated by

Panretinal photocoagulation (PRP) is the preferred form of treatment of proliferative diabetic retinopathy(PDR). ... 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 6/e p278