Congenital strabismus includes: internal strabismus, external strabismus, paralytic strabismus, special type of strabismus, and nystagmus. When a child is less than 3 months old, it is difficult for parents to detect the symptoms of strabismus, but when the child is a little older, careful parents can observe that the child has “opposite eyes” (internal strabismus), “rolling eyes”, “eyes under strong light” (external strabismus), “crooked neck”, and “tilted head”. “(exotropia), “crooked neck”, “tilted head looking” (paralytic strabismus, special type of strabismus, nystagmus), etc. These are the early phenomena of the disease. When these symptoms appear, parents should promptly go to the hospital to check and confirm the diagnosis. Congenital internal strabismus mostly occurs within six months after birth, and the best age for surgery is within 18 months; part of the adjusted internal strabismus is operated after 3-6 months of wearing glasses. The best age for surgery is within 2 years of age; intermittent exotropia is operated before school age; perceptual exotropia is operated for cosmetic reasons only and can be postponed until after 18 years of age. Patients with congenital paralytic strabismus, special class of strabismus, and such patients since birth have compensatory head position (skewed head for vision) due to their special reasons, and over time, cheek deformity and scoliosis appear; in addition, patients with paralytic strabismus need surgery in stages, so they should be operated early in the onset so as not to affect the overall development of the child. Nystagmus should be performed after the age of 6 and up to the age of 9. The ultimate goal of treatment for strabismus is to restore visual function in both eyes, to achieve normal eye position, good visual acuity and to restore perfect stereopsis.