AIM:To assess the therapeutic effects of krypton yellow laser for the prevention of diabetic macular edema in proliferative diabetic retinopathy(PDR).

METHODS:A total of 108 eyes of 58 patients with PDR were grouped into 3 groups. PDR without macular edema(macular treated by krypton yellow laser); PDR without macular edema(macular without treat); PDR with macular edema(macular treated by krypton yellow laser); all patients were treated by pan retinal photocoagulation(PRP); the postoperative vision, fundus fluorescein angiography and macular OCT were compared.

RESULTS:The group of PDR without macular edema(macular treated by krypton yellow laser)was better in vision than other groups.

CONCLUSION: Macular treated by krypton yellow laser before PRP can prevent macular edema.