Strabismus, also referred to as "lazy-eyed", "crossed-eyed", or "wall-eyed", is a condition that occurs when a person cannot align both of their eyes on a single object at the same time. Roughly five percent of all children have some degree of strabismus.
Movement of the affected eyes can either occur all of the time—constant strabismus—ot only under certain circumstances, such as high stress or illness, called intermittent strabismus. Children with the condition will occassionaly experience double vision as a result of the conflicting visual signals, but eventually, the brain leanrs to disregard one of the eyes.
Early treatment is strongly advised for children with strabismus because it is not a condition that children simply "grow out of". Some treatments for strabismus include optical devices, vision and muscle therapy, and, as a last resort, surgery.