Unexpected stereoacuity following surgical correction of long-standing horizontal strabismus.

Eight patients with long-standing large-angle constant tropias unexpectedly achieved stereoacuity (40 seconds of arc in six patients and 60 seconds of arc in two patients) following strabismus surgery. There are few reports in the literature documenting this finding. The authors found that if excellent postoperative alignment can be achieved in patients with good bilateral visual acuity, some of these patients will demonstrate high-grade stereoacuity even if the preoperative findings suggest this outcome to be unlikely.