Exotropia is a type of strabismus (eye turn) where one eye is seen wandering outwards but all of the eye muscles still maintain full motion.

Esotropia is a type of strabismus (eye turn) where one eye is seen crossing inwards but all of the eye muscles still have full motion.

Strabismus can occur when one of the eye muscles is either working too hard or not hard enough and an eye turn is noticed.