Before cataract surgery, blood pressure should be controlled well, with high pressure at 90 – 150 mmHg and low pressure at 60 – 90 mmHg. Fasting blood sugar for diabetic patients should be less than 8 mmol/L. Generally, cataract surgery is performed under local anesthesia or table anesthesia, thus a perfect surgery depends not only on the excellent technique of the surgeon, but also on the close cooperation of the patient. During the operation, patients should keep a calm mind, do not be nervous and do not hold their breath. Do not move your limbs casually. If you want to move, please tell the surgeon first and keep the operating table clean. Cooperate with the surgeon for eye rotation, do not turn casually.