In September 2018,Diabetes CareA study on the correlation between the time within the target range determined by continuous glucose monitoring and type 2 diabetic retinopathy completed by Professor Jia Weiping, Department of Endocrinology and Metabolism, Sixth People's Hospital affiliated to Shanghai Jiaotong University was published online [Lu J, Ma X, Zhou J, et al. Association of time in range, as assessed by continuous glucose monitoring (CGM), with diabetic retinopathy in type 2 diabetes. Diabetes Care, 2018]. This study is the first in the world to explore the relationship between time within the target range (TIR), a parameter of continuous glucose monitoring (CGM), and diabetic complications. The study found that TIR was significantly correlated with the risk of retinopathy in patients with type 2 diabetes, and was independent of the classic glycemic control index-glycosylated hemoglobin (HbA1c), suggesting that TIR could become a new index to evaluate the level of glycemic control, which provided a new idea for further optimization and improvement of the current blood glucose evaluation system dominated by HbA1c.