AIM:To evaluate the effect of Ranibizumab(lucentis)combined with macular grid pattern photocoagulation in the treatment of macular edema caused by branch retinal vein occlusion(BRVO).METHODS:Forty-two patients(42 eyes) diagnosed as macular edema caused by BRVO by fundus fluorescence angiography(FFA) and optical coherence tomography(OCT) were enrolled.The patients were randomized divided into two groups:group 1(combined therapy group) received lucentis intravitreal injection combined with macular grid patter...