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.
The first thing to understand about de facto segregation is that it has nothing to do with the law. Since the institution of slavery itself, as it existed in colonial and pre-Civil War America, was a system that subordinated one race to another, segregationist laws were not established until after the war.