I. Choice of surgical incision Currently, there are mainly corneal rim incision, ciliary body flat incision and corneoscleral tunnel incision. For children who do not need IOL implantation in one phase, the corneal rim incision can be used for ultrasound emulsification or simple perfusion and fine needle aspiration of the nucleus and cortex. For children who need IOL implantation, it is more appropriate to choose ciliary flattening incision or corneoscleral tunnel incision. This incision can maintain the corneal arch anatomy and is less likely to cause postoperative astigmatism, and the incision can be watertight even without sutures, and shallow anterior chamber and iris prolapse are less likely to occur intraoperatively, and the incidence of endophthalmitis is low. Second, the choice of posterior capsule treatment Posterior cataract is the most common complication after congenital cataract surgery, so it has become the consensus of the majority of doctors to perform continuous circumferential capsule tearing of the posterior capsule membrane at the same time after surgery. However, simply performing posterior capsule membrane incision cannot completely prevent the formation of posterior capsule clouding, and the intact anterior vitreous interface can provide a good scaffold for lens epithelial cells to form new posterior capsule clouding, so after If an IOL is implanted at this time, it will be more difficult to perform the surgery. Implanting a crystal in the cut posterior capsule can often lead to re-dislodgement of the vitreous, thus increasing the chance of postoperative lens deviation and tilt; in addition, the irrigation and suction anterior biosurgical head is thicker, with less space for operation in the infant eye, poor control of the resection range, and greater harassment of the vitreous. This increases the risk of retinal detachment and macular edema after surgery. Based on the pursuit of safer postoperative results, the 25G sutureless vitrectomy system has been used for congenital cataract surgery in recent years, which can bring better surgical results and eliminate the complications that may be associated with the traditional procedure. The surgical procedure is the same as adult cataract surgery in the early stage, while preserving the anterior chamber viscoelastic, the IOL can be safely implanted in the capsular bag, and the 25G sutureless vitrectomy system is used to perform continuous circumferential incision of the posterior capsule through the flat part of the ciliary body, while the anterior vitrectomy is performed. In addition, because of the small scleral puncture, the postoperative healing is fast, the incision is not prone to leakage, and there is no vitreous traction.