Patients with external strabismus mainly need set training, but can also be trained by covering one eye and finding the balance point of binocular vision. Collective training is often referred to as eye-to-eye training. This practice is that the patient can use a ballpoint pen or pencil and hold it in front of both eyes with the flat of the hand, with the pencil moving out from the nose and then gradually moving towards the nose, with both eyes staring at the pencil, for several times, in order to exercise the cohesive function of both eyes. Monocular masking is to cover the healthy eye and see with the strabismic eye, insist on daily training. When looking for the balance point of binocular vision, patients can observe in the mirror to maintain normal binocular parallax state, and insist on daily training. However, training generally can not completely cure the larger degree of external strabismus, patients need to perform surgical treatment to correct the eye position. It is recommended that patients with strabismus should consult a doctor to evaluate their condition and follow the doctor’s instructions.