When strabismus occurs, the first step is to go to a regular hospital ophthalmology department for a routine eye examination and a specialist examination for strabismus to determine the cause of the strabismus. Usually a masking and de-masking test, alternating masking test, and synoptic examination are required. In the case of paralytic strabismus, it is important to check for ptosis, lid fissure abnormalities, and compensatory head position. As well as a neurological examination to exclude neurological disorders causing strabismus. In the case of common strabismus, there may be a relationship with refractive and regulatory factors, so non-surgical options as well as surgical options are available. For example, mild occluded strabismus can be treated without treatment. If there is obvious visual fatigue and binocular hypotropia, trigeminal correction can be considered; for fully corrected hyperopia, there is still visual fatigue, and the strabismus is greater than 12 degrees, surgical treatment can be considered. For example, for refractive regulating strabismus, complete correction treatment after paralysis of the ciliary muscle is considered. For non-refractive accommodative internal strabismus, surgical treatment is considered, usually a posterior migration of the internal rectus muscle is performed, and satisfactory results can be obtained. In case of non-concurrent strabismus, the more common clinical condition is paralytic strabismus, which requires a neurology consultation to find the cause and treat the cause, and then consider surgery if the strabismus is still obvious after the condition is stabilized.