Summary of case history,　A 58-year-old middle-aged male, complained of "sudden vision impairment for 8 days", had sudden blurred vision in his left eye without obvious causes a week ago , without occlusion sensation during vision, and pain during eye movement. He came to our department after treatment in other hospitals with vision did not improve significantly. Ophthalmology specialist examination: far vision: right 0.6, left 0.05, iOP: right 12.5mmHg, left 10.7mmHg; Bilateral anterior segment was not special, fundus microscopy: right eye fundus no obvious abnormality. The boundary of the optic disc in the left eye was clear, the color was slightly light, C/D≈0.4, the artery was thin, the reflection was enhanced, and the cross sign (+) was observed. The examination of the optic disc showed a small flake of bleeding below the nose, lint spots in the omentum near the vascular alignment, and mild gray edema in the macular area. Physical examination on admission showed: blurred vision in the left eye with foreign body sensation, no pain of eye rotation, no chest tightness and palpitations, no cough and sputum, no abdominal distension and pain, normal diet and sleep, urine regulation, stool 3-4 times/day, thin quality. The tongue is dull, and the fur is white. Pulse string and weak.,TCM diagnosis,　sudden blindness(deficiency of qi and blood stasis),Western medicine Diagnosis,　central retinal artery occlusion (left eye),Therapeutic methods,　First visit: left eye vision 0.05,he method of promoting blood circulation and removing blood stasis, supplementing Qi and clearing collaterals, Qi deficiency and blood stasis, Qi and blood can not cause blockage of eyes and collaterals, and the addition or subtraction of Bu Yang Huan Wu Decoction is given. The second visit: left eye vision improved to 0.3. The patient felt occasional frequent urination, phlegm, dull tongue, white fur. Pulse string and weak. The treatment reflects the replenishing of Qi, the reuse of yellow astragalus, Chinese medicine on the basis of the front plus Bupleuri and Shengma to make the essence further superior. The third visit: the blurred left eye was significantly better than before, and the left and right vision reached 0.6. After mydriasis, the left eye fundus showed that the retinal edema was disappeared. The patient complained that the symptoms of phlegm, frequent urination, poor sleep and other symptoms were significantly improved, and the tongue was dim and the fur was white. Pulse string and weak. In the treatment, the method of activating blood stasis and supplementing Qi and clearing collaterals was adopted, and the original prescription was used in traditional Chinese medicine.,Clinical outcomes,　After 2 weeks of treatment, the visual acuity of the patient's left eye stabilized at 0.6. After mydriasis examination of the right eye fundus showed no obvious retinal edema.