title: Cross-validation of the Turkish version of the 25-item National Eye Institute Visual Functioning Questionnaire (NEI-VFQ 25).
abstract: OBJECTIVE
  To test the validity and reliability of the Turkish version of the self-administered form of the National Eye Institute Visual Functioning Questionnaire (NEI-VFQ 25).
  
  
  METHODS
  Patients with no limitations to respond to a health status interview and affected by a chronic eye disease were enrolled. The Turkish versions of the abbreviated form of World Health Organization Quality of Life (WHOQOL-BREF) and the NEI-VFQ 25 instruments were administered to all participants.
  
  
  RESULTS
  The mean (SD) age of the participants was 60.9 (14.5) years. There were 61 patients with one of the following conditions: Cataract (57.4%), diabetic retinopathy (13.2%), age related macular degeneration (ARMD) (11.4%), glaucoma (9.8%) and degenerative myopia (8.2%). The Cronbach alpha of the overall scale was 0.97; the Cronbach alpha ranged from 0.94 to 0.78 for the subscales. The physical, psychological, environmental and social domains of the WHOQOL-BREF had fair to good correlations with the NEI-VFQ 25 (r = 0.68 to r = 0.26), which indicated a sufficient convergent validity. Patients with lower visual acuity (VA) had lower index scores than those with higher VA (p = 0.001), which showed a sufficient responsiveness.
  
  
  CONCLUSIONS
  Statistical analysis showed that Turkish version of the NEI-VFQ is a valid and reliable instrument to measure vision-related quality of life in patients with chronic eye diseases.
authors: Department of Ophthalmology, Celal Bayar University, Manisa, Turkey. baris.toprak@bayar.edu.tr
authors: Ahmet Baris
authors: AB
authors: Toprak
authors: Erhan
authors: E
authors: Eser
authors: Cenap
authors: C
authors: Guler
authors: Fatma Esin
authors: FE
authors: Baser
authors: Hüseyin
authors: H
authors: Mayali
mesh_terms: D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D005128:Eye Diseases / Q000453:epidemiology / Q000503:physiopathology*; D005260:Female; D006306:Health Surveys; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D009316:National Institutes of Health (U.S.); D009885:Ophthalmology; D011788:Quality of Life; D015203:Reproducibility of Results; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires; D014421:Turkey; D014481:United States; D014787:Vision Tests / Q000295:instrumentation* / Q000379:methods; D014792:Visual Acuity / Q000502:physiology*