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 Jim Crow Laws of the southern states, which endured until the 1960s, are examples of de jure segregation. In contrast, de facto racial segregation, which occurred in other states, was accomplished by factors apart from conscious government activity.