In addition to diabetic retinopathy resulting in vision loss in diabetic patients, cataracts are also an important factor affecting vision. Diabetic patients can develop metabolic cataract cataracts due to abnormal glucose metabolism leading to impaired crystal metabolism, or age-related cataracts (also known as senile cataracts) due to aging. Regardless of the type of cataract, patients with diabetes have earlier onset, faster progression, and earlier maturation of cataracts compared to those without diabetes. There are also some younger people with more advanced disease who have cataracts that take a very short time to form and develop until they mature, and can fully mature and cause blindness in a matter of days. Therefore, if you have diabetes or have just discovered that you have diabetes, you must go to the hospital for a comprehensive eye examination to determine whether you have cataracts and to check for diabetic retinopathy. Once it is determined that you have cataracts that affect your vision and require surgery, you must ask your doctor to check the fundus for diabetic retinopathy, and when your general condition allows, it is best to have a fundus angiogram to determine if you need laser treatment for retinopathy. Anyone who needs to perform fundus laser, try to laser before cataract surgery. If it is impossible to observe fundus before surgery due to serious cataract and cannot determine whether fundus laser is needed, then fundus examination must be performed in time after cataract surgery, and laser treatment must be performed in time, otherwise intraocular hemorrhage may occur and seriously affect vision and cataract effect. Therefore, diabetic patients should not neglect fundus examination because of the momentary improvement of vision after cataract surgery, and must go to the ophthalmology department for fundus examination. In addition, long-term and stable control of blood sugar, blood pressure and blood lipids is also important for long-term stability of vision.