Strabismus

Also called  squint , or  heterotropia  failure of the eyes to align properly on the object toward which a person seeks to direct his gaze. The deviant eye may be directed inward, toward the other eye (cross-eye, or esotropia); outward, away from the other eye (walleye, or exotropia); upward (hypertropia); or downward (hypotropia). The squint is called comitant if the deviation remains constant no matter in what direction