One of the most common complications in diabetic patients is diabetic retinopathy, and this complication becomes more pronounced as the duration of diabetes increases. Therefore, for diabetic patients, it is recommended to have regular fundus examinations at the ophthalmology department. The method of examination is relatively simple, and generally requires dilating the pupil to examine the fundus, that is, using dilating medication to dilate the pupil, so that the fundus can be examined in a larger area and the condition of the fundus can be understood more fully, and any hemorrhage, hemangioma or exudation in the retina, retinal fissure, etc. can be detected early. Generally, in the early stage of the disease, it may only show scattered punctate hemorrhage on the surface of the retina, which does not need to be treated at this stage, and it is fine to control blood sugar. However, if serious complications occur, such as blood accumulation in the vitreous cavity or proliferation on the retinal surface, these cases need to be treated with early surgery or laser photocoagulation.