Retinal vein obstruction is a relatively common vascular disease of the fundus. It has a complex etiology and is closely related to hypertension, atherosclerosis, blood hyperviscosity and hemodynamic abnormalities, and is often multifactorial. It is common in middle-aged and elderly patients, and its manifestations vary according to the early and late stages of the disease, the location and degree of obstruction. Mild type: The symptoms are mild or absent, the visual acuity can be normal or mildly reduced, and the visual field is normal or mildly altered. In severe cases, the visual acuity can be reduced to manual, and in cases of combined arterial obstruction, the visual acuity can be reduced to light perception only. The diagnosis can be determined based on clinical manifestations, typical fundus changes, and also combined with FFA examination. Drug therapy is the mainstay, and retinal laser photocoagulation is feasible if necessary.