1.Ophthalmic examination: visual acuity of both eyes, intraocular pressure, ultrasound, full set of cataract in both eyes (IOL Master), slit lamp examination, ophthalmoscopy, tear duct flushing, etc. 2, routine examination: generally contains blood routine, blood biochemistry (liver and kidney function, blood sugar, electrolytes), urine routine, preoperative coagulation full set, pre-transfusion full set (hepatitis, syphilis, AIDS screening), electrocardiogram, chest X-ray, etc. 3, past medical history: If you have been diagnosed with certain underlying diseases: such as diabetes, hypertension, etc., or have special circumstances: such as long-term anticoagulants after heart valve replacement, history of drug allergies, history of previous surgery in the eye (especially post-operative complications), etc. should be factually reported to your doctor. And it is better to control blood sugar and blood pressure in internal medicine before examining admission for cataract surgery. 4. Disinfection of the operated eye: If you have frequent tearing and more eye stools, you should explain to your doctor in order to do tear duct flushing and exclude any tear duct obstruction dacryocystitis. After admission, you will be routinely given a bottle of eye drops, mostly 0,3%-0,5% (left) ofloxacin eye solution to be used for both eyes. Please make sure that you have ordered at least 8 times from the time you first order to the time before surgery. (Note: the eye drops need to pay attention to: reverse the bottle, first squeeze off a drop to rinse the bottle, and then point 1-2 drops into the lower conjunctival sac (the groove in the lower eyelid), the middle can not touch your eyelashes, skin and anything else) 5, pre-operative preparation: practice head position: supine, keep your head in a positive position, practice three movements to cooperate with the surgeon: a. Open your eyes and look at the ceiling directly above without moving b. Open your eyes and look at your feet c. Open your eyes and look at the top of your head Practice breathing: Because of the aseptic operation and sterilization of laying towels during surgery, there will be 3-4 layers of cotton cloth blocking the front of your nose, some elderly people who do not adapt will find it difficult to breathe, so practice breathing before surgery by folding a dry towel in half and then gently resting it on your nose and mouth to eliminate the feeling of discomfort during surgery. 6.Decide what kind of IOL to use. 7.Decide what kind of refractive status to retain after surgery. 8.Understand the possible complications of the surgery and sign the surgical consent form. 9. Pre-operative preparation for patients under general anesthesia: Generally, this surgery can be tolerated with local anesthesia, but individual cases require general anesthesia. After ten o’clock the night before the surgery, no more food and water can be consumed.