Objective To detect the expression level of retinol binding protein 4(RBP4) and neutrophil-lymphocyte ratio(NLR) in type 2 diabetic retinopathy(DR) patients, and to explore the relationship of RBP4 and NLR with DR. Methods A total of 163 subjects were investigated, including 41 cases of type 2 diabetes mellitus(T2DM group),40 cases of non-proliferative type 2 diabetic retinopathy(NPDR group), 42 cases of proliferative diabetic retinopathy(PDR group) and 40 cases of normal control(NC group). Venous plasma gl...