title: Bilateral recession of superior rectus muscles: its influence on A and V pattern strabismus.
abstract: OBJECTIVE
  To determine whether bilateral superior rectus recession modifies A and V pattern strabismus.
  
  
  METHODS
  Three patients with V patterns and eight patients with A patterns underwent bilateral superior rectus recession with neither oblique muscle surgery nor vertical displacement of the horizontal rectus muscles. Another three patients with A patterns underwent simultaneous superior oblique tenotomy and superior oblique recession.
  
  
  RESULTS
  Two of the patients with V patterns demonstrated an increase in the V pattern after surgery; one was unchanged. Five of the patients with A patterns converted to V patterns after surgery. In the remaining three patients the pattern was eliminated. The three patients who underwent superior oblique tenotomy along with superior rectus recession had large shifts toward V pattern (mean shift, 40 delta).
  
  
  CONCLUSIONS
  Bilateral superior rectus recession tends to increase V patterns and reduce A patterns. Superior rectus recession may be synergistic with superior oblique tenotomy in collapsing an A pattern.
authors.affiliation: Pediatric Ophthalmology Foundation, Buenos Aires, Argentina.
authors.forename: N B
authors.initials: NB
authors.lastname: Melek
authors.forename: T
authors.initials: T
authors.lastname: Mendoza
authors.forename: A O
authors.initials: AO
authors.lastname: Ciancia
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology*; D005133:Eye Movements / Q000502:physiology*; D006801:Humans; D009801:Oculomotor Muscles / Q000601:surgery*; D013285:Strabismus / Q000503:physiopathology* / Q000601:surgery