First of all, I think it is necessary to introduce the definition of strabismus. Strabismus is the eye problem, also called as crossed eyes or squint eyes. It refers to the misalignment of the two eyes. When one eye points at a direction, while the other eye points at a total different direction. The causes of strabismus vary a lot, including genetics, inappropriate development of the fushion center of the brain, disorder of the muscles, nerves and injuries. Although in most cases, it is caused by brain disorder, yet strabismus surgery is mostly to reach the alignment by adjusting the muscles. Strabismus surgery help patients to get good cooperation of the two eyes. It can slove the double vision as well as the monocular caused by squint. It indeed improves the binocular vision of the patients a lot,but it can't correct the refractive problems, such as myopia, astigmatism or hyperopia.