The cost of cataract surgery has a lot to do with the type of IOL selected, and also with the medication used, in addition to regional differences are also influencing factors. At present, the mainstream cataract surgery procedure is ultrasonic emulsification lens extraction (Phaco), which has been popularized in China. The procedure is as follows: after surface anesthesia of the operated eye, the eyelid is opened with a lid opener, two incisions are made at the corneal margin, one main incision and one side incision, and then a viscoelastic is injected to hold up the space in front of the eye and reserve space for the later surgical operation, and then a circular hole is opened in the anterior capsule of the lens, just like we open a canning jar, and the lid has to be uncovered to pull out the contents. After the lid is opened, the cloudy lens nucleus and lens cortex inside are emulsified by ultrasound and then aspirated out to preserve the capsular bag, and then the IOL is placed inside the bag, and the surgery is over. The cost is the cost of the surgery performed by the surgeon on one hand and the cost of the IOL on the other. Generally speaking, the national cataract surgery fee varies from province to province and from region to region, and it is within 2000 RMB, while the IOL fee varies from several hundred to tens of thousands of dollars depending on the specific type.