A strabismus of 15 degrees is a very obvious strabismus, which can be shown directly from the appearance, that is, the eyes are not in the normal position, inward or outward skewed, which can have a serious impact on the development of visual function, especially in children or infants, so it should be checked early and treated clearly and early. The treatment methods for different types of strabismus are different, and can be broadly divided into two treatment options. The first is conservative treatment, which is applicable to the treatment of moderate internal strabismus, because this strabismus is related to refractive error, so it can be corrected by wearing glasses. The second, exotropia or vertical strabismus requires surgery, which is also a relatively routine surgery in ophthalmology, and the surgery is not complicated as long as the examination is clear with the indications for surgery, we should operate as soon as possible.