After posterior cataract laser surgery, it usually does not recur. When cataract surgery is performed, the clouded lens is removed and a layer of the posterior capsule of the lens is retained to support the placement of a new IOL so that perfect vision can be achieved after surgery. However, over time, the posterior capsule will gradually become cloudy in some patients, and the patient will again feel a loss of vision, which is called posterior cataract. The incidence of posterior cataract is higher in the diabetic population and is also higher in younger patients than in older patients because of the high regenerative capacity of the lens epithelium. The treatment of posterior cataract is very simple and can be solved by laser surgery to cut the posterior capsule. This procedure is non-contact and does not require the patient to go back into the operating room for the procedure, but only in the outpatient laser room, using 1-2 minutes to complete the procedure without any pain and with immediate postoperative results. Therefore, after laser surgery, since the posterior capsule, right in the center of the pupillary area, has been cut into a hollow laser hole and the lens epithelium loses the area for continued migration, there is usually no recurrence after posterior cataract laser surgery.