To evaluate the efficacy of 577nm micropulse laser photocoagulation with grid/focal treatment for diabetic macular edema.~To investigate influence of 577nm micropulse laser photocoagulation on structure and function of macula compared with 532nm subthreshold laser photocoagulation.
This randomized, parallel controlled, clinical-trial aims to evaluate the therapeutic efficacy and safety of 577nm micropulse laser photocoagulation for diabetic macular edema compared with 532 subthreshold laser photocoagulation.