Objective To observe the effect of Yigan Mingmu decoction on treatment of diabetic macular edema. Methods 49 cases (91 eyes) of diabetic macular edema patients were randomly divided into two groups. The observation group with 25 cases (49 eyes) was treated with Yigan Mingmu decoction, the control group with 24 cases (42 eyes) was given triamcinolone acetonide retrobulbar injection, the course was for 6 months. The changes of visual acuity and macular edema in the two groups after treatment were observed. Results After treatment of 6 months, the total efficiency of the observation group was 93....