中老年人易患高血压、动脉硬化、慢性肾炎、动脉内膜炎。患有这些疾病的人,视网膜中央动脉管壁往往增厚,管腔相应变窄,血流受阻,加之管壁粗糙,容易形成微小的血栓,发生血栓性闭塞。风湿性心脏病患者心脏瓣膜上的赘生物脱落,也可能堵塞视网膜中央动脉。血管高度痉挛时,也会造成 Middle-aged and elderly prone to hypertension, arteriosclerosis, chronic nephritis, endarteritis. People with these diseases, the central retinal artery often thickening of the vessel wall, the corresponding lumen narrowing, blocked blood flow, combined with rough wall, easy to form tiny thrombosis, thrombotic occlusion. Patients with rheumatic heart disease on the valve valve neoplasm shedding, may also block the central retinal artery. Vascular spasm can also be caused