Co-occurring exotropia is a condition in which the axial deviation of one eye is outward and cannot be overcome by binocular fusion function. It can be categorized into esotropia, intermittent esotropia, and constant esotropia. In exotropia, there is a tendency for the ocular axis to be skewed, but due to good binocular fusion, the visual axis of the two eyes can be maintained parallel, and only when one eye is blocked does the eye position appear to be skewed outward. Intermittent external strabismus is the state between external hidden strabismus and constant external strabismus. It can be shown as orthophoria under the condition of concentration, but will show dominant external strabismus under the condition of fatigue and mental laxity, etc. It is characterized by early onset, unstable strabismus and photophobia, etc., and has the tendency of progressing to constant external strabismus, and requires surgical treatment when it cannot control the position of the eyes or when binocular visual function decreases. Constant strabismus is characterized by persistent outward deviation of eye position, which cannot be restored by visual fusion and other functions, and may be accompanied by amblyopia, refractive error, etc. Currently, surgical treatment is the main treatment, and early detection and treatment will have a positive effect on the restoration and development of visual function and vision. In cases of co-morbid strabismus, it is recommended to seek timely medical treatment and regular review, and under the guidance of the doctor’s advice, training or surgical treatment.