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

Inclusion Criteria: * Diagnosed with diabetes mellitus. * Diagnosed with non-proliferative diabetic retinopathy, including moderate and severe diabetic retinopathy * and corrected VA≥45 letters(ETDRS), equivalent the decimal value of 0.16(20/125). * Diagnosed with the syndrome and signs of TCM. * HbA1C≤8.0%. * Ages ranged from 35 to 75 years. * Joined in the test voluntarily and signed the Informed consent by GCP regulation. Exclusion Criteria: * Complicating severe vitreous hemorrhage, or requiring laser and vitrectomy treatment. * The patients who have been received the therapy of Retina laser photocoagulation. * The patients whose dioptric media is so turbid that hard to evaluate the fundus picture. * DMKA or other acute metabolic disturbance, or complicating severe acute infection within a month. * Combined with other severe Diabetic complication. * Having any allergic reaction to some drugs, food and pollen etc. or hypersensitiveness * Pregnant or breast feeding. * combined with primarily severe diseases such as cardiovascular, hepatic，renal illness ,hemopoietic system disease, and psychosis. * Combined with glaucoma, uveitis, ocular neuropathy and severe cataract etc. * Participated in other clinical trial within 3 month.