When strabismus occurs, in addition to the unsightly appearance, it is important to lose the function of monocular vision in both eyes, which may lead to amblyopia, facial asymmetry, and squinting neck. Therefore, strabismus should be treated with surgery at the right time. Surgery has two purposes: First, it can have a cosmetic effect and can change the appearance. Second, and more importantly, the highest goal of surgery is to reestablish or restore visual function in both eyes.