Strabismus can be caused by a variety of reasons, the most common being developmental abnormalities, refractive errors or trauma to the eye. 1. Developmental anomalies: Congenital developmental anomalies mainly cause non-adjustable strabismus, which is usually present at birth and requires surgical correction to cure. 2. Refractive errors: These are usually the cause of accommodative strabismus, such as myopia causing accommodative esotropia and hyperopia causing accommodative esotropia, which usually need to be corrected by wearing glasses. 3. Eye trauma: eye trauma may cause paralytic strabismus or restrictive strabismus, which is related to the limitation of extraocular muscle movement caused by the trauma, and most of them need to be treated by surgery. Strabismus patients should go to regular hospitals as soon as possible, through detailed examination to clarify what causes strabismus, and follow the doctor’s instructions for treatment, the younger the age of strabismus intervention, the better the results.