It is very difficult for children to recover from internal strabismus. Internal strabismus is categorized into refractive internal strabismus and non-refractive internal strabismus. In the case of refractive esotropia, it is still associated with a high degree of hyperopia, which causes over-adjustment and leads to esotropia. This condition can be corrected with eyeglasses, and as the amount of farsightedness decreases with age, the esotropia will improve slightly, but there is little hope that it will heal on its own. However, there is little hope that it will completely resolve on its own. There are also some children who can gradually improve and reach a normal condition, but these children are relatively few. In the case of non-refractive esotropia, the esotropia remains uncorrected even after the use of eyeglasses. In this case, the esotropia is not self-correcting, and surgical correction is often required to correct the esotropia.