Strabismus is a vision problem that parents generally pay attention to. However, the most important problem of strabismus is that besides causing significant differences in appearance, the most important thing is that the abnormal eye position can affect the development of vision and may cause amblyopia if left untreated. Strabismus can be divided into internal strabismus, external strabismus and vertical strabismus, with internal strabismus being the most common, followed by external strabismus. In children with congenital internal strabismus, surgery is generally recommended before the age of 6 months to 2 years to avoid missing the opportunity to develop the eye’s blending ability. In addition to exotropia, the problem of blurred vision, eye fatigue, and photophobia may also occur, turning the intermittent exotropia into exotropia. If you are worried about whether your child has strabismus, you may want to shine a wide-angle flashlight on your child’s eyes at home. If the light falls on the center of the pupil at the same time, parents can rest assured; if the light falls on the center of the pupil and the other falls on the inside or outside of the pupil, parents must take their child to the doctor.