There are many methods of visual acuity practice needed after the operation of internal strabismus, which mainly focus on the visual fusion function, and commonly include prism correction, orthoptic gaze training, and synesthesia machine method. 1. Patients with strabismus, especially those with monocular strabismus, often suffer from diplopia or confusing vision due to the difference in gaze between the two eyes. After correcting strabismus through medial rectus posterior migration, it is also necessary to wear a trephine lens to help strabismus corrective training, so as to achieve a good visual effect. 2. For pediatric patients, brightly colored objects can be selected for orthoptic gaze training so that patients can actively adopt orthoptic vision after surgery to correct the visual abnormalities caused by strabismus. 3. Synoptic machines are also commonly used for visual training, which can restore vision by correcting stereopsis in both eyes. After surgery for strabismus, the patient should follow the doctor’s advice for proper visual training and seek medical advice if visual abnormalities occur.