Strabismus is a very common ophthalmology disorder. The clinical manifestation of strabismus is that when the eyes are looking straight ahead, others may mistakenly believe that the eyes are not looking straight ahead, but inward or outward, called strabismus. Because it can seriously affect the development of stereoscopic vision in both eyes, especially in children, it requires early surgical correction once detected. However, the correction method is different for different types of strabismus. In the case of congenital internal strabismus in infants, most children may have refractive error, which can be partially corrected in the early stages by wearing glasses. If the strabismus is not completely corrected after the correction of frame glasses, surgery is still needed. Exotropia, vertical strabismus, and types of strabismus usually require surgical treatment.