The items to be checked before cataract surgery include blood pressure, blood sugar, electrocardiogram and chest X-ray, eye related examination and so on. 1. Blood pressure: Before the surgery, it is necessary to check whether the blood pressure is normal or not, too high blood pressure will affect the normal operation, and even lead to damage of blood vessels during the surgery. 2. Blood sugar: diabetic patients should control their blood sugar before cataract surgery, too high blood sugar will increase the chance of infection after surgery. 3. Electrocardiogram and chest X-ray: Tests such as electrocardiogram and chest X-ray can be done to find out if there is any serious heart or lung disease. 4. Eye-related examinations: including visual function, fundus, intraocular pressure examination, etc. Before cataract surgery, patients should undergo visual function and fundus examination to understand the condition of the patient’s visual function and fundus, and to predict the visual acuity after surgery. If the eye is in a state of high pressure it will make the surgery more risky and difficult, so the intraocular pressure should also be checked. It is important to cooperate with the doctor during the examination, and the doctor will conduct the examination according to the specific situation. Pay attention to eye hygiene before the surgery, don’t rub your eyes with your hands, and don’t let dirty water into your eyes. It is recommended that patients go to the ophthalmology department of regular hospitals for consultation and improve the preoperative cataract examination program under the guidance of doctors.