The age of surgery for children with strabismus is from 2 to 6 years old, because long-term strabismus can affect the visual development of the children, while the age of surgery for adult patients with strabismus is wider, and strabismus includes congenital internal and external strabismus as well as adjustable internal and external strabismus. 1. Congenital internal and external strabismus: Strabismus detected at birth or within 6 months of birth is called congenital internal and external strabismus. This type of strabismus has a greater impact on the visual function of the child, and it is recommended to have surgery around 2 years of age in order to establish binocular vision. 2. Adjustable internal and external strabismus: Before the age of 6 is the peak period of visual function development of the eyes, strabismus occurs, firstly, corrected by wearing glasses, if still can not be corrected, then consider surgical treatment, as far as possible, before the age of 6. Because adult vision is fully developed, there is no optimal age for surgery if strabismus occurs, and when to perform strabismus surgery is related to the patient’s symptoms. It is recommended that patients with strabismus consult a doctor to evaluate their condition and follow the doctor’s instructions.