Alternating esotropia is a common type of strabismus, which is characterized by the inability of the patient’s two eyes to work together and a deviation of one eye. Patients with alternating esotropia may have a deviation in the right eye if they look with their left eye, and an ocular deviation in the left eye if they use their right eye to gaze at an object, but the patient is unable to look at the object with both eyes at the same time, i.e., alternating esotropia. Alternate strabismus is usually due to myopia or convergence insufficiency, and can be temporarily observed if visual quality or visual function is not affected. If the angle of the strabismus is too large or the patient’s stereo vision is affected, surgery may be considered. It is recommended that patients with alternating esotropia seek prompt medical attention to evaluate their condition and follow the doctor’s instructions for treatment.