But when there is a disruption and the muscles do not work together, some form of strabismus, including exotropia, may occur. Other causes may involve the nerves that transmit information from the brain to the muscles, or the part of the brain that directs eye movements.
de facto segregation-segregation (especially in schools) that happens in fact although not required by law. separatism, segregation-a social system that provides separate facilities for minority groups.
Definition of de facto. 1  1 : actual; especially : being such in effect though not formally recognized a de facto state of war Whatever it says on the calendar, Florida has de facto summer. 2  2 : exercising power as if legally constituted a de facto government the de facto head of state.