A Study on Traditional Chinese Medicine (TCM) Comprehensive Protocol of Prevention and Control in Diabetic Retinopathy

1. Title: A Study on TCM comprehensive protocol of Prevention and Control in Diabetic Retinopathy. 2. Objectives of study: To evaluate the Intervention effect of integrate control protocol on reducing the incidence rate of proliferative diabetic retinopathy, PRP and MVL. Then produce a high performance, optimize, convenient, applicable and demonstrated protocol of integrate control with Intervention of TCM and west medicine. 3. Study Type: Interventional 4. Study Design: Multi-center, Randomized, Blind (Subject, Investigator, Outcomes Assessor), Parallel Assignment, Positive controlled clinical study. 5. Sample size: 480 subjects , divided into test and control groups equally. 6. Primary endpoint: incidence rate of proliferative diabetic retinopathy, panretinal photocoagulation