The popular way of cataract surgery is ultrasound emulsification plus IOL implantation, which is a minimally invasive surgery with short operation time, good surgical results and small incisions. However, the surgery requires strict requirements for the operating room, which needs a sterile operating room. Therefore, cataract surgery like this must be performed in a laminar flow operating room in a regular tertiary hospital or an ophthalmology specialty hospital, where the surgical safety factor is still relatively high. The instruments are in a regular hospital, and the air environment is sterilized after maintenance, so that the possibility of infection can be avoided. In addition, the surgical instruments or materials for cataract surgery are used by one person and managed exclusively. Therefore, in a strict sense, cataract surgery is best performed in a regular tertiary hospital or ophthalmology hospital.