Strabismus is a common eye disease in children, and the prevalence of strabismus in our population is currently about 3%. If one eye looks at the target while the other eye deviates from the target, i.e., both eyes cannot look at the target in front of them at the same time, we call it strabismus. The majority of what we usually call strabismus is common strabismus, and the causes of common strabismus are various, the common ones are: 1. Refractive error: people who are farsighted often form internal strabismus, while people who are nearsighted can form exotropia. 2. 2.Sensory impairment: Due to congenital and acquired reasons, such as corneal clouding, congenital cataract, vitreous clouding, abnormal macular development, refractive aberration, etc., resulting in low vision in one or both eyes and the inability of both eyes to establish fusion reflex to maintain eye balance, can also lead to strabismus. 3. Genetic factors: Since the same family has similar characteristics in eye anatomy and physiology and development, strabismus caused by anatomical and developmental abnormalities may be passed on to the offspring in a multi-gene inheritance. Strabismus not only affects the appearance, but more importantly, affects the normal development of the patient’s monocular visual function and binocular visual function, thus causing amblyopia and failure to form good stereo vision. Although the strabismus eye is open at the same time, the visual acuity of the strabismus eye is extremely poor, so it can be said that the strabismus patient does not have binocular vision when strabismus is present. Some patients with strabismus often have an abnormal head position such as a tilted or sideways face, which will affect the normal development of the face and neck. In addition, strabismus often develops at an early age, which will have many adverse effects on the patient’s psychological, physical, learning, life and work throughout his or her life. Therefore, strabismus should be detected and treated as early as possible, and only after correction of the eye position can the development of binocular vision be provided, otherwise, even if the eye position is corrected in adulthood, it is only cosmetic, and it is difficult to achieve the purpose of functional cure.