Retinal vein occlusion (RVO) is commonly known as a “stroke” in the blood vessels of the eye, and is one of the most common eye diseases in the middle-aged and elderly that can easily lead to vision loss. According to the Classic of Chinese Medicine, the “Review of Yaohuan”, this disease is mostly caused by the seven emotions, diet, strain, heat and phlegm fire; in clinical practice, it is mostly seen in patients with hypertension, diabetes and arteriosclerosis. Retinal vein obstruction can occur in the central and branch veins, with branch obstruction being more common. It is worth noting that RVO is not uncommon among young people due to the accelerated pace of work and life in the present society, staying up late, busy work and mental tension can also lead to its occurrence. In addition, contraceptive pills and so on can also lead to RVO. 1.What are the symptoms of RVO patients? Patients with RVO can show sudden, painless vision loss, or black shadows obscuring in front of their eyes; there are also a few patients whose vision can be mildly reduced, and as the disease develops, the vision is significantly blurred until complete blindness. 2.Why do these symptoms occur in RVO patients? Because when RVO occurs, whether it is branch vein obstruction or central vein obstruction, a large flame hemorrhage, macular edema, or even intravitreal hemorrhage occurs in the affected retina, which can be manifested as sudden vision loss. Some patients with less retinal involvement or no macular involvement in the early stage of hemorrhage show mild vision loss, but if not treated in time, the condition will continue to worsen and serious damage to vision will also occur, all need to seek medical attention as soon as possible. 3.Why does RVO cause blindness? It is mainly due to the lack of early and timely treatment. In RVO, macular edema, vitreous blood and retinal or papillary neovascularization can seriously damage the patient’s vision or cause blindness. In the later stage of severe cases of neovascular glaucoma, not only is there no hope to improve vision, but even eye pain to the point of affecting normal life requires eye removal. 4.How to treat RVO? Once patients have vision loss, or have black shadows obscuring in front of their eyes, they should seek medical attention as soon as possible and under the guidance of doctors for examination and treatment. 1）First of all, we should control the systemic condition, such as blood pressure, blood sugar, blood lipid, etc. 2) Depending on the condition of the fundus and the examination report, the doctor will give treatment recommendations such as medication, laser or surgery. 3）Regular follow-up is required after either medication or surgery.