Strabismus is a clinical phenomenon in which the eye axis of either eye deviates from its normal position. It may be caused by monocular abnormalities in both eyes or neuromuscular abnormalities that control eye movements, or after various mechanical restrictions. The classification of strabismus is complex. If the classification is based on the state of fusion, it is divided into occult and dominant strabismus. If the eye movement and the change of eye position deviation in different gaze positions are classified, it can be divided into common strabismus and non-common strabismus, and the latter is divided into paralytic strabismus and restrictive strabismus. If classified according to the gaze eye, there are alternating strabismus and monocular strabismus. If classified according to the direction of eye deviation, there are horizontal strabismus, vertical strabismus, etc. Regardless of the classification, if you find a significant strabismus, you should rush to the hospital for a routine eye examination, a strabismus specialist examination, including oculomotor function examination and binocular visual function examination. For common strabismus, refractive error correction followed by surgical treatment is considered. If the strabismus is not common, we usually consider finding the cause and treating the cause, but if the strabismus is still obvious after the condition has stabilized for more than six months, we will consider surgery again.