Common internal strabismus can be divided into three types: moderate, partially moderate and non-moderate internal strabismus. Adjusted internal strabismus refers to those who have hyperopia and whose internal strabismus can be completely corrected by wearing glasses, so this kind of internal strabismus does not need surgery and requires glasses; partially adjusted internal strabismus refers to those whose internal strabismus is partially improved by wearing glasses, but some internal strabismus still remains, so this kind of internal strabismus can be surgically corrected by wearing glasses that cannot be corrected, and glasses need to be continued after surgery; non-adjusted internal strabismus refers to those whose internal strabismus is not improved by wearing glasses, so this kind of internal strabismus needs surgery. This type of strabismus requires surgical treatment. Therefore, children with internal strabismus usually need to have their pupils dilated with atropine at the first visit, and if they have high hyperopia, they need to wear adequate corrective glasses. If there is no significant change in the strabismus after one year, and if the child is cooperative with the examination, surgery is indicated.