Most children with congenital strabismus cannot be cured by conservative treatment, much less get better on their own, and basically require surgery. Many parents procrastinate, expecting the strabismus to be relieved, which is actually not true. For strabismus, the timing of surgery is critical and directly affects the establishment of binocular vision after surgery, which is usually fully established before school age. At present, the international consensus is that the earlier a child with congenital internal strabismus has surgery, the better, and surgery can be done six months after birth. In the case of congenital exotropia or paralytic strabismus, surgery should also be performed as early as possible in order to establish good binocular vision after surgery, usually before the age of two, if the child can cooperate with the examination. If the child is too old at the time of consultation and misses the best time for surgery, the establishment of binocular vision after surgery will be much more difficult than in children with early surgery, and may not even be established for life, and there will always be double vision. Therefore, parents of all strabismus patients are advised to have surgery as early as possible if their child develops the disease in order to facilitate the recovery of binocular vision after surgery.