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 spatial separation of a RACE, CLASS OR ETHNIC GROUP by discriminatory means. Racial segregation can be enforced by law, as in the southern US until the 1950s, or in the system of APARTHEID in South Africa.