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.
In law and government, de facto, describes practices that exist in reality, even if not legally recognised by official laws. It is commonly used to refer to what happens in practice, in contrast with de jure, which refers to things that happen according to law. Unofficial customs that are widely accepted are sometimes called de facto standards.