title: Choosing appropriate patient-reported outcomes instrument for glaucoma research: a systematic review of vision instruments.
abstract: OBJECTIVE
  To identify vision Patient-Reported Outcomes instruments relevant to glaucoma and assess their content validity.
  
  
  METHODS
  MEDLINE, MEDLINE in Process, EMBASE and SCOPUS (to January 2009) were systematically searched. Observational studies or randomised controlled trials, published in English, reporting use of vision instruments in glaucoma studies involving adults were included. In addition, reference lists were scanned to identify additional studies describing development and/or validation to ascertain the final version of the instruments. Instruments' content was then mapped onto a theoretical framework, the World Health Organization International Classification of Functioning, Disability and Health. Two reviewers independently evaluated studies for inclusion and quality assessed instrument content.
  
  
  RESULTS
  Thirty-three instruments were identified. Instruments were categorised into thirteen vision status, two vision disability, one vision satisfaction, five glaucoma status, one glaucoma medication related to health status, five glaucoma medication side effects and six glaucoma medication satisfaction measures according to each instruments' content. The National Eye Institute Visual Function Questionnaire-25, Impact of Vision Impairment and Treatment Satisfaction Survey-Intraocular Pressure had the highest number of positive ratings in the content validity assessment.
  
  
  CONCLUSIONS
  This study provides a descriptive catalogue of vision-specific PRO instruments, to inform the choice of an appropriate measure of patient-reported outcomes in a glaucoma context.
authors.affiliation: Health Services Research Unit, University of Aberdeen, 3rd Floor, Health Sciences Building, Foresterhill, Aberdeen, AB25 2ZD, Scotland, UK. r05jc8@abdn.ac.uk
authors.forename: Jemaima
authors.initials: J
authors.lastname: Che Hamzah
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Burr
authors.forename: Craig R
authors.initials: CR
authors.lastname: Ramsay
authors.forename: Augusto
authors.initials: A
authors.lastname: Azuara-Blanco
authors.forename: Maria
authors.initials: M
authors.lastname: Prior
mesh_terms: D002755:Choice Behavior; D005901:Glaucoma; D006801:Humans; D017063:Outcome Assessment, Health Care; D012106:Research; D057566:Self Report; D011795:Surveys and Questionnaires