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.
Segregation (during the Civil Rights era in the United States) De facto racial discrimination and segregation in the United States during the 1950s and 1960s was simply discrimination that was not segregation by law (de jure). Jim Crow Laws, which were enacted in the 1870s, brought legal racial segregation against black Americans residing in the American South.