Patient: Description (main symptoms, onset time) Diabetes for 10 years, fasting blood sugar 5-7; recently I can’t see anything in my right eye, at most I can only see some shadows; in my left eye about 1.2 The doctor told me to do laser treatment first, and then cataract surgery in both eyes. Can I ask if I can have surgery and what will happen after surgery? What will happen if I don’t have surgery? Li Meiyu, Ophthalmology Department, Peking University First Hospital: Elderly people with diabetes can also have surgery, but fasting blood sugar should be controlled below 7mmol/L before surgery, otherwise it will easily cause complications such as infection. In addition, blood pressure should be controlled within the normal range. You have had diabetes for 10 years and may have diabetic retinopathy. You should have fundus fluoroscopy first and decide whether to have laser according to the situation before surgery. The result of the surgery is related to the presence of diabetic retinopathy and the severity of the disease. Your right eye can only see some shadows and should be operated, otherwise overripe cataract will cause complications such as secondary glaucoma, which will eventually cause irreversible blindness. We suggest you to visit a larger local hospital or come to Beihang University Hospital for consultation.