title: Relationship Between Binocular Summation and Stereoacuity After Strabismus Surgery.
abstract: To describe the relationship between binocular summation and stereoacuity after strabismus surgery.
  
  
  
  Prospective case series.
  
  
  
  setting: Stein Eye Institute, University of California Los Angeles.
  
  
  
  Pediatric strabismic patients who underwent strabismus surgery between 2010 and 2015.
  
  
  
  Early Treatment Diabetic Retinopathy Study visual acuity, Sloan low-contrast acuity (LCA, 2.5% and 1.25%), and Randot stereoacuity 2 months following surgical correction of strabismus.
  
  
  
  The relationship between binocular summation (BiS), calculated as the difference between the binocular visual acuity score and that of the better eye, and stereoacuity.
  
  
  
  A total of 130 postoperative strabismic patients were studied. The relationship between binocular summation and stereoacuity was studied by Spearman correlation. There were significant correlations between BiS for 2.5% LCA with near and distance stereoacuity (P = .006 and P = .009). BiS for 1.25% LCA was also significantly correlated with near stereoacuity (P = .04). Near stereoacuity and BiS for 2.5% and 1.25% LCA were significantly dependent (Pearson χ(2), P = .006 and P = .026). Patients with stereoacuity demonstrated significantly more BiS in 2.5% LCA of 2.7 (P = .022) and 3.1 (P = .014) letters than did those without near or distance stereoacuity, respectively.
  
  
  
  These findings demonstrate that stereopsis and binocular summation are significantly correlated in patients who have undergone surgical correction of strabismus.
authors.affiliation: Stein Eye Institute, University of California, Los Angeles, Los Angeles, California.
authors.forename: Jaffer M
authors.initials: JM
authors.lastname: Kattan
authors.affiliation: Stein Eye Institute, University of California, Los Angeles, Los Angeles, California.
authors.forename: Federico G
authors.initials: FG
authors.lastname: Velez
authors.affiliation: Stein Eye Institute, University of California, Los Angeles, Los Angeles, California.
authors.forename: Joseph L
authors.initials: JL
authors.lastname: Demer
authors.affiliation: Stein Eye Institute, University of California, Los Angeles, Los Angeles, California.
authors.forename: Stacy L
authors.initials: SL
authors.lastname: Pineles
mesh_terms: D000328:Adult; D017668:Age of Onset; D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D009801:Oculomotor Muscles / Q000601:surgery*; D013508:Ophthalmologic Surgical Procedures; D011184:Postoperative Period; D011446:Prospective Studies; D013285:Strabismus / Q000503:physiopathology / Q000601:surgery*; D014787:Vision Tests; D015348:Vision, Binocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult