The interval between bilateral eye surgery: there are two types of treatment: bilateral symmetrical cataract and asymmetrical cataract. For bilateral symmetrical cataract, there is still a controversy in the academic field whether to operate on both eyes simultaneously in infants, while opponents mainly consider the possibility of infectious endophthalmitis, which will involve both eyes and cause disastrous consequences to the child’s vision if it occurs; proponents believe that one more general anesthesia is one more risk to life and support Simultaneous surgery in both eyes: performing surgery on one eye and then treating the other eye exactly as the other surgery is performed minimizes the risk of surgical anesthesia and reduces the chance of simultaneous infectious endophthalmitis in both eyes. If both eyes are operated in stages, surgery on one eye should be followed by surgery on the other eye within a week as soon as possible. Optometry and amblyopia treatment for the lens-free eye should be started as soon as possible after surgery on both eyes to reduce the risk of amblyopia. For children over 4 years of age, surgery in the other eye can be postponed until the wound in the operated eye has healed and there is no significant ocular discomfort. In infants with bilateral asymmetric cataracts, in principle, the more cloudy side of the lens should receive surgery first, and surgery in the other eye can be delayed until the operated eye has received optometry.