Horror fusionis: a report of five patients.

Horror fusionis is an uncommon anomaly and is rarely reported in the literature.Five adults with long-standing diplopia associated with horror fusionis were examined.All patients had strabismus since early childhood and had been treated at that time either with surgery, occlusion, and/or orthoptics/vision therapy. Prisms could not eliminate the diplopia. Graded occlusion was attempted with one patient but was not tolerated. Another patient with...