A diabetic patient needs to be reviewed regularly in the endocrinology department, mainly to find out his blood glucose status, any complications in the whole body, etc. Diabetic patients in ophthalmology are also recommended to come to the ophthalmology department for regular review. If a patient who comes to the ophthalmology department for the first time has a dilated pupil to look at the fundus and no diabetic retinopathy is seen, it is recommended to come to the ophthalmology department once a year for a review with good blood sugar control. If hemorrhage or exudation is found in the fundus and diabetic retinopathy is present, regular review is recommended because diabetic retinopathy will gradually worsen with poorer glycemic control and the increasing duration of diabetes. If it is only the earliest lesion, i.e., the background stage, with only partial hemorrhages and relatively good glycemic control, a six-monthly review may be recommended, but if the glycemic control is poor, a three-monthly review is recommended. If there are not only small hemorrhages but also exudates in the fundus, the time for review may be shortened in this type of patients. Diabetic retinopathy will gradually worsen as the disease progresses, but depending on the severity of the fundus, the review time can be longer or shorter. Diabetic patients must be reviewed regularly at the ophthalmology department, even if the condition of the fundus is relatively stable. Since blood sugar can fluctuate at any time, the chances of diabetic retinopathy will increase as the disease gradually lengthens.