eye AE strabismus AE 10042159 heterotropia An eye AE that results in an intermittent or constant misalignment of an eye so that its line of vision is not pointed at the same object. Strabismus is caused by an imbalance in the extraocular muscles which control the positioning of the eyes. WEB: http://en.wikipedia.org/wiki/Strabismus KM, YH cross-eyed wall-eyed