There is a difference between true and false “crossed eyes”, which is clinically known as “internal strabismus”. First of all, it is important to distinguish between “true and false internal obliquity”; a false internal obliquity is not an internal strabismus, but is caused by the small distance between the eyes, the close proximity of the inner canthus (inner corner of the eyes), and the presence of canthal redundancy, which makes the eyes appear less centered in the lid fissure and closer to the nasal side, creating the illusion of “crossed eyes”. This gives the illusion of “crossed eyes” and does not require correction. True internal obliquity is a condition in which one eye looks at the target and the other eye is to the side of the nose and cannot look at the same target. The general process of correcting true internal strabismus is: (1) First, we need to check whether the patient is combined with hyperopia by dilated eye examinations, and if combined with hyperopia some patients will correct themselves completely by wearing glasses; (2) If the strabismus decreases after wearing glasses, but there is still strabismus, the remaining part of the strabismus needs to be treated surgically; (3) If the strabismus remains unchanged after wearing glasses, surgical correction treatment is needed (3) If the strabismus remains unchanged after the glasses are put on, surgery is required. Therefore, it is necessary to distinguish between true and false “crossed eyes”, if it is a pseudo-intra-strabismus, no correction is needed; if it is a true intra-strabismus, the first dilated pupil examination and glasses, according to the correction of the situation to perform internal strabismus correction surgery treatment.