title: The development and assessment of a self-perceived quality of vision questionnaire to test pseudophakic patients.
abstract: OBJECTIVE
  To develop and test a questionnaire to assess quality of vision in pseudophakic patients.
  
  
  METHODS
  The problems with existing health measurement scales and the need for a new questionnaire are first discussed. Development of the new questionnaire from concept to completion is presented and all stages discussed. The questionnaire is then tested for internal consistency, reliability and validity.
  
  
  RESULTS
  The Cronbach Alpha for internal consistency was 0.92. British Standards Institution repeatability coefficient was satisfactory at 6.6. Discriminant construct validity testing by extreme groups demonstrated excellent discrimination between patients with functionally significant posterior capsule opacification (PCO) and no significant PCO (Mann-Whitney U test, p = 0.001).
  
  
  CONCLUSIONS
  The questionnaire is validated as a robust, stable measure of pseudophakic visual symptoms with a high degree of clinical utility. It should be invaluable for the many studies that compare outcomes from different forms of modern cataract surgery with implantation of different intraocular lenses.
authors.affiliation: Princess Alexandra Eye Pavilion, Edinburgh, Scotland, UK. TAslam@AOL.COM
authors.forename: T M
authors.initials: TM
authors.lastname: Aslam
authors.forename: D
authors.initials: D
authors.lastname: Gilmour
authors.forename: S
authors.initials: S
authors.lastname: Hopkinson
authors.forename: N
authors.initials: N
authors.lastname: Patton
authors.forename: P
authors.initials: P
authors.lastname: Aspinall
mesh_terms: D000203:Activities of Daily Living; D002387:Cataract Extraction; D006305:Health Status Indicators; D006801:Humans; D017060:Patient Satisfaction; D019591:Pseudophakia / Q000523:psychology*; D011788:Quality of Life; D015203:Reproducibility of Results; D012647:Self-Assessment; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D014785:Vision, Ocular / Q000502:physiology*; D014792:Visual Acuity