Intermittent exotropia, X(T), is the most common form of exotropia. It is a phoria controlled by fusional mechanisms that breaks down into a manifest tropia when the fusion is interrupted. This interruption may be caused by fatigue, illness, or inattention. Patients typically have excellent vision and stereopsis. Intermittent exotropia generally does not require surgery unless there is an increase in frequency or duration of the deviation. Bilateral lateral rectus recessions are the most common surgical procedure used to correct X(T).
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