Exotropia is one form of strabismus. Strabismus is a physical disorder in which the two eyes are improperly aligned with each other. This eye problem has several forms of appearance. With one eye moving regularly, the other eye may point in, out, up or down. These four conditions are respectively called cross eye, exotropia, hypertropia and hypotropia. It is usually caused by an unequal pulling of muscles at one side of the eye, or even an ocular muscle paralysis.
Exotropia, also called walleye, is a disorder that the eye turns outside. People who have exotropia usually have one eye wander or move toward the outside corner of the eye. It is usually found in every age group.