Central retinal artery is the terminal artery, and its occlusion causes acute retinal ischemia and severe visual loss, which is one of the emergencies leading to blindness. The ciliary vascular system communicates with each other, so obstructive diseases are rare. If the ophthalmic artery is blocked, its branches, the central retinal artery and the posterior ciliary artery, are ischemic, which completely cuts off the inner and outer layers of the retina, resulting in higher blindness rate and more serious consequences. It has three characteristics: sudden blindness; Opalescent opalescence in the posterior pole retina; There are cherry red spots on the macula.