The interval between surgery in both eyes: there are two types of cataracts: symmetrical cataracts in both eyes and asymmetrical cataracts. For bilateral symmetrical cataracts, there is still controversy in the academic community as to whether to operate on both eyes simultaneously in infants. Opponents mainly consider the possibility of infectious endophthalmitis, which, if it occurs, will involve both eyes and have disastrous consequences for the child’s vision; proponents believe that one more general anesthesia is one more risk to life, and support simultaneous surgery on both eyes: perform surgery on one eye and then treat the other eye exactly according to the procedure of the other surgery. This minimizes the risk of surgical anesthesia and reduces the chance of simultaneous infectious endophthalmitis in both eyes. If both eyes are operated on in stages, the other eye should be operated on as soon as possible within a week after the surgery on one eye, and the lens-free eye optometry and amblyopia treatment should be started as soon as possible after the 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 on the other eye can be delayed until the operated eye has received optometry.