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.
Though segregation was legally ended in 1964, the reality of segregation didn't go away. This type of segregation was known as de facto, meaning 'in practice,' and it was expressed through the social customs and expectations enforced by the white authorities.