Fundus lesions are one of the most common chronic complications of diabetes, and without timely intervention, more than half of diabetic patients go blind. The manifestations and hazards of diabetic retinopathy are introduced as follows: 1. early patients do not feel anything, but doctors can already see through the examination that the patient’s fundus has changed; 2. when there is retinal edema, patients can have blurred vision; 3. if there is more vitreous hemorrhage, it obviously affects vision, and even complete vision is missing; 4. when retinal edema affects the macula, patients can feel the visual 5, late severe hemorrhagic retinal detachment, often blind; 6, if the occurrence of iris or atrial angle neovascularization, can appear neovascular glaucoma symptoms, can have uncontrollable eye pain headache nausea and vomiting, etc.