When both eyes cannot look at a target at the same time, with one eye on the target and the other off the target, it is called strabismus. Children with strabismus often exhibit eyes that are slanted to look at things, or sometimes they look at things with their heads tilted. The strabismic eye may be squinted inward or outward, or it may be squinted vertically. Classification of strabismus Strabismus is generally divided into common strabismus and paralytic strabismus. There are horizontal strabismus, vertical strabismus, and rotational strabismus. Identification of strabismus Crooked head strabismus: usually caused by congenital eye muscle paralysis, this paralysis will cause the eye position to appear skewed, and with eye movement disorders, seeing things often appear double shadow, the baby in order to eliminate or alleviate this discomfort that appear crooked head. Congenital oblique neck: a deformity in which the neck is tilted to one side, often manifested as a neck lump, oblique neck, facial asymmetry and other complications, is found right after birth. Pseudo-internal obliquity (entropion): It is an illusion of appearance, i.e., the eye position looks similar to strabismus, while in fact the eye position is positive, the visual axis is parallel, the corneal reflection point is located in the center of the pupil, and no eye position movement occurs during the masking de-masking test. It is common in people who are obese, have a wide nasal root, have a pronounced inner canthus or have a small pupillary distance. Strabismus is one of the most important causes of amblyopia. 2. It affects the development of binocular vision and prevents the establishment of normal binocular vision. 3. In order to eliminate the diplopia produced by strabismus, children with strabismus sometimes adjust their head position to reduce the degree of diplopia, and the long-lasting skewed head position will affect the development of the child’s neck, affecting the appearance and causing psychological developmental disorders. Treatment of strabismus 1. Early detection and early treatment. 2. If the child has a congenital strabismus that cannot be corrected by wearing glasses, surgery should be performed at the age of 2-3. 3. For the internal strabismus occurring after 2 years of age, which is mostly related to over-adjustment, this strabismus should first be corrected by wearing glasses; if it can be corrected after 3-6 months of wearing glasses, no surgery is needed; if it cannot be completely corrected, the residual strabismus should be treated by surgery. 4. For those with dominant exotropia, surgery should be performed as soon as possible after excluding obvious refractive errors.