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Strabismus in which one eye is directed to the fixation point while the other is directed upward (right or left hypertropia). If one eye fixates while the other is directed downward, the condition is called hypotropia (right or left hypotropia). Syn. for hypertropia is sursumvergens strabismus and anoopsia; for hypotropia is deorsumvergens strabismus. See three-step test.