Correlation Between the Pulmonary Function Parameters and the Circulatory Parameters (PSV, EDV, RI) of Retrobulbar Blood Vessels (CRA, PCA, and OA) in 48 T2DM Patients Did Not Combinate With DR

Inclusion Criteria: 1. The patients were diagnosed with T2DM according to the guidelines of the American Diabetes Association; 2. No smoking history, pulmonary disease nor pulmonary infection within a fortnight; 3. Did not have hepatopathy, nephropathy, and gastrointestinal disease; and 4. Likely to have good compliance and able to visit our hospital for periodic assessments. Exclusion Criteria: 1. T1DM, gestation and lactation; 2. Renal inadequacy, a serum creatinine \>132 µmol/L (male), or a serum creatinine \>123 µmol/L (female); 3. hypohepatia, the liver enzyme was two times higher than normal; 4. Intensive care with insulin treatment; 5. The patients combinated with DR and hypertension (antihypertensive drugs were used); 6. Patients with other eye conditions that could affect the blood flow, such as high degree myopia, maculopathy of any origin, glaucoma, and those with a history of laser treatment or introacular surgery; 7. New York Heart Association class III or IV heart failure, a history of coronary angioplasty, coronary stent placement, coronary bypass surgery, or myocardial infarction within 6 months; 8) Cholesterol-lowering drugs can not control the blood-fat (TC \> 250 mg/dl, HDL-C \< 30 mg/dL, LDL-C \> 170 mg/dl, TG \> 200 mg/dl) adequately; and 9\) Use of systemically injected glucocorticoids within 3 months prior to our study.