With the improvement of living standards and changes in diet, the incidence of diabetes is increasing year by year. Many diabetic patients can develop fundopathy after 5 years if their blood sugar is not well controlled. On the one hand, the occurrence of diabetic eye disease is related to good or bad blood glucose control; on the other hand, it is closely related to the occurrence and duration of diabetes. It is worth noting that many type 2 diabetic patients do not know how long they have had the disease when they are diagnosed with diabetes, so they should have an eye examination as soon as they are diagnosed. What are the risks of diabetes mellitus to the eye: 1. Small crimson dotted microangiomas on the bulbar conjunctiva of the lid fissure with tortuous, cystic dilatation of veins, uneven blood columns, and spiral capillaries. 2, cataract. 3.Diabetic retinopathy. 4.Ocular ischemia caused by optic neuropathy, extraocular muscle paralysis, dysregulation and optic nerve atrophy. 5, refractive error. 6, neovascular glaucoma. Among them, diabetic retinopathy is the main cause of blindness in diabetic patients.