What is strabismus and how do I know if my baby has it? Strabismus (say: "stra-biz-muss") is a disorder in which the eyes do not line up properly. Instead, the eyes appear to cross, or one eye may wander to the side. For normal vision, both eyes need to look in the same direction at the same time. When a child has a crossed or wandering eye, he or she gets a different picture from each eye. The child's brain naturally tries to fix this problem by blocking out the picture from the weaker eye. If strabismus is not fixed when a child is young, the child's brain will always ignore the pictures from the weak eye. This kind of vision loss is called amblyopia (say: "am-blee-o-pee-ah").