title: Horror fusionis: a report of five patients.
abstract: BACKGROUND
  Horror fusionis is an uncommon anomaly and is rarely reported in the literature.
  
  
  METHODS
  Five adults with long-standing diplopia associated with horror fusionis were examined.
  
  
  RESULTS
  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 an asymmetrical dissociated vertical deviation could ignore the second image by fixating with the eye with the smaller deviation. Two patients reported the diplopia becoming less noticeable over the years.
  
  
  CONCLUSIONS
  Because of its poor prognosis, the diplopia associated with horror fusionis must be differentiated from other types of diplopia occurring in adults with childhood onset strabismus.
authors.affiliation: School of Optometry, University of Alabama at Birmingham 35294-0010, USA.
authors.forename: R P
authors.initials: RP
authors.lastname: Rutstein
authors.forename: B
authors.initials: B
authors.lastname: Bessant
mesh_terms: D000328:Adult; D004172:Diplopia / Q000209:etiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D013285:Strabismus / Q000150:complications* / Q000628:therapy; D015357:Vision Disparity; D015348:Vision, Binocular