Diabetes mellitus is an endocrine metabolic disorder that causes a multifaceted, multi-organ complex lesion in the body. The legend that in diabetic patients, wounds do not heal easily is not true. Diabetic patients can enjoy the same surgical treatment as the general population when their blood sugar is under control. However, during cataract surgery, diabetic patients should pay special attention to the following points: 1. Adhere to the diabetic diet, eat regularly and quantitatively, and eat more vegetables and soy products. Live a regular life and pay attention to physical exercise. 2.Strictly execute the will, take medication and injection on time and actively control blood sugar. 3.Actively cooperate with the physician for some necessary whole body examination, usually including functional examination of heart, liver, kidney and lung and several times of blood glucose examination (adjust the drug dose accordingly). For those who postpone the surgery for any reason, they should continue to follow the medical prescriptions. “Sharpening the knife does not miss the wood” ah. The doctor will also pay special attention to the presence of infection foci in the eye appendages and neighboring organs, the presence of neovascularization in the iris, anterior and posterior adhesions, normal intraocular pressure, and the presence of paralysis in the eye muscles, in addition to the usual examination items. If necessary, a graphical retinal current map and visual evoked potentials will be performed to determine retinal and optic nerve function. These examinations will take some time, so the patient should not be anxious, but should make good use of the time to “prepare” and enter the surgery as soon as possible. 5, do not compare with others, have a full understanding of the prognosis of surgery. First, the postoperative reaction is usually heavy, so the postoperative medication may also be more, and the postoperative vision also has a gradual rise process; second, the final vision recovery should be psychologically prepared. Diabetes can not only lead to diabetic cataract, but also cause diabetic retinopathy. According to statistics, the incidence of diabetic retinopathy in China is 45% to 58%, which is closely related to the duration of diabetes. 38% to 39% of people with fundus changes below 5 years, 50% to 56% for 5 to 10 years, and 69% to 90% for more than 10 years, and gradually worsens with the duration of the disease. 6. Pay attention to protein supplementation in postoperative diet, systemic or local application of antibiotics to prevent infection, appropriate bed rest, and keep the bowels unobstructed. In conclusion, diabetic cataract surgery should not only consider the progress of cataract but also consider the damage of diabetes to other organs of the body, weigh the pros and cons, operate carefully, and pay attention to the prevention of postoperative complications.