Diabetic retinopathy (DR) is one of the most common microvascular complications of diabetes. Diabetic retinopathy is often a symptom of long-term hyperglycemia damage to the microvasculature of the fundus, and is mainly associated with blurred vision, decreased visual acuity, and even blindness. Diabetic retinopathy tends to occur earlier and more severely in patients with type 1 diabetes, while it tends to occur later in patients with type 2 diabetes. Diabetic retinopathy often begins with blurred vision, flashes of light, mosquitoes, and foreign body sensation, followed by vision loss, fundus hemorrhage, retinal detachment, and even blindness. Therefore, diabetic retinopathy is a serious complication of diabetes, which is caused by long-term poor blood glucose control on the damage to the blood vessels in the fundus of the eye. When symptoms appear, we should control blood glucose to meet the standard as soon as possible, and at the same time, seek early ophthalmology treatment to prevent more serious complications.