The best age for correction of strabismus is 4-5 years old, and early treatment can protect the tertiary visual function of children. Strabismus can be divided into internal strabismus, external strabismus, vertical strabismus, etc. Pediatric strabismus is mostly intermittent strabismus, and the symptoms are not obvious, or manifest as visual fatigue. Pediatric internal strabismus can be corrected by glasses or surgery, while external strabismus usually needs to be corrected by surgery. The timing of treatment is different for different types of strabismus, for example, congenital internal strabismus should be corrected by glasses 3-6 months after birth. In order to protect the function of simultaneous vision, fusion vision and stereo vision, try to perform corrective surgery for strabismus around the age of 3. If the treatment is done too late, the child will not be able to achieve tertiary visual function. Mild strabismus can also be temporarily observed. If the strabismus increases or if the child shows symptoms of deviated head vision, he or she should be promptly examined and treated by an ophthalmologist.