title: Responsiveness of NEI VFQ-25 to changes in visual acuity in neovascular AMD: validation studies from two phase 3 clinical trials.
abstract: OBJECTIVE
  To examine the responsiveness of the National Eye Institute Visual Function Questionnaire-25 (NEI VFQ-25) by using data from the MARINA and ANCHOR trials in neovascular age-related macular degeneration (AMD) and to establish the change in the NEI VFQ-25 associated with a 15-letter change in best corrected visual acuity (BCVA).
  
  
  METHODS
  In MARINA, 716 patients were randomized to monthly intravitreal ranibizumab (0.3 or 0.5 mg) or sham injections. In ANCHOR, 423 patients were randomized to monthly ranibizumab (0.3 or 0.5 mg) with sham photodynamic therapy (PDT) or sham ocular injections with verteporfin PDT. Patients had follow-up interviews and BCVA measurements over 24 months. Data were analyzed separately for MARINA and ANCHOR, and treatment groups were pooled within each trial. The clinically relevant difference in NEI VFQ-25 was estimated based on regression models of change from baseline to month 12 in BCVA.
  
  
  RESULTS
  Subgroups categorized by BCVA change (>or=15 letters gained, <15 letters lost or gained, or >or=15 letters lost) differed substantially in mean change in NEI VFQ-25 composite scores and three pre-specified subscale scores (near activities, distance activities, and vision-specific dependency) over 12 months. According to the regression models, the difference associated with a 15-letter change was 4 to 6 points for the composite score and the three pre-specified subscales.
  
  
  CONCLUSIONS
  These data support the use of the NEI VFQ-25 as a responsive and sensitive measure of vision-related function in neovascular AMD populations. Based on MARINA and ANCHOR data, a 4- to 6-point change in NEI VFQ-25 scores represents a clinically meaningful change corresponding to a 15-letter change in BCVA.
authors.affiliation: Retina Associates of Florida, Tampa, FL 33609, USA. ivansuner@gmail.com
authors.forename: Ivan J
authors.initials: IJ
authors.lastname: Suñer
authors.forename: Gregg T
authors.initials: GT
authors.lastname: Kokame
authors.forename: Elaine
authors.initials: E
authors.lastname: Yu
authors.forename: James
authors.initials: J
authors.lastname: Ward
authors.forename: Chantal
authors.initials: C
authors.lastname: Dolan
authors.forename: Neil M
authors.initials: NM
authors.lastname: Bressler
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D020533:Angiogenesis Inhibitors / Q000627:therapeutic use; D000911:Antibodies, Monoclonal / Q000627:therapeutic use; D061067:Antibodies, Monoclonal, Humanized; D020256:Choroidal Neovascularization / Q000188:drug therapy / Q000503:physiopathology*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007267:Injections; D008268:Macular Degeneration / Q000188:drug therapy / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009316:National Institutes of Health (U.S.); D000069579:Ranibizumab; D012680:Sensitivity and Specificity; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires; D014481:United States; D014792:Visual Acuity / Q000502:physiology*; D014822:Vitreous Body
chemical_list: D020533:Angiogenesis Inhibitors; D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D000069579:Ranibizumab