Hidden strabismus is mainly caused by the patient’s incoordination of the regulation and collection functions, but the degree is not serious, so it does not show the overt strabismus. Hidden strabismus is a common disease in ophthalmology, which means that patients usually do not have symptoms of strabismus, but the doctor can induce strabismus when examining, usually caused by the patient’s regulation and collection function is not coordinated, when the patient needs to use the regulation function, it does not lead to the corresponding collection function, so that the amplitude of the two eyes converge to reduce and cause the hidden external strabismus. Generally, hidden exotropia does not need treatment, for refractive error can wear glasses to correct the refractive error, it is possible to reduce the hidden exotropia, for some of the patients with symptoms of visual fatigue, can also be done through the adjustment function of the eye training to alleviate the symptoms.