Differences of biochemical indicators and optical coherence tomography angiography in patients with different degrees of diabetic retinopathy Journal title: Eye Science (Yanke Xuebao) Authors: Shibei AI, Zong ZHENG, Mingzhe CAO, Fangfang DU, Xinxin LIU, Nan XU, Hongjun PENG, Lijiao LU Subject(s): Ophthalmology