In diabetic patients, abnormally high blood glucose leads to retinal vascular atresia and retinal tissue hypoxia, resulting in a series of pathological changes such as retinal microangiomas, edema, exudation, hemorrhage, neovascularization, and vitreous proliferation, called diabetic retinopathy. Diabetic retinopathy can lead to blindness in the affected eye. The risk of blindness is 25 times higher in diabetics than in normal people. The development of diabetic retinopathy is insidious, and by the time a patient feels a significant loss of vision, the lesion is often advanced. In the process of lesion development, early patients mostly have no obvious conscious symptoms, and when patients feel vision loss, the disease has often progressed to a very serious stage, at which time most patients have lost the best time for treatment. When diabetic eye disease develops to a certain stage, the eye lesion cannot be reversed. Numerous studies have shown that the best way to prevent diabetes from causing blindness is through preventive treatment. The most effective way to get timely treatment is for diabetic patients to have regular fundus examinations so that doctors can detect the lesions early and give timely preventive treatment when the patient does not show obvious symptoms. Only through regular eye examinations, early detection and early treatment, can we prevent blindness caused by diabetes.