The development of the Indian vision function questionnaire: field testing and psychometric evaluation.


Gupta, SK; Viswanath, K; Thulasiraj, RD; Murthy, GV; Lamping, DL; Smith, SC; Donoghue, M; Fletcher, AE; (2005) The development of the Indian vision function questionnaire: field testing and psychometric evaluation. The British journal of ophthalmology, 89 (5). pp. 621-7. ISSN 0007-1161 DOI: 10.1136/bjo.2004.050732

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Abstract

OBJECTIVE: To develop and evaluate the acceptability, reliability, validity, and responsiveness of the Indian vision function questionnaire (IND-VFQ). METHODS: Problem statements from previous qualitative studies were reduced to a 45 item interviewer administered questionnaire representing three a priori domains (general functioning, psychosocial impact, and visual symptoms) which was evaluated in patients with cataract (n = 420), glaucoma (n = 120), diabetic retinopathy, or age related macular degeneration (n = 120) and normal controls (n = 120). Standard methods were used for item reduction and to evaluate psychometric properties. RESULTS: Psychometric item reduction produced a 33 item questionnaire. Psychometric evaluation showed that two of the three scales (psychosocial impact and visual symptoms) had good acceptability, and that all three scales showed high internal consistency (alpha >0.80; item-total correlations 0.54-0.86) and test-retest reliability (>0.89). All three scales showed moderate evidence of convergent and discriminant validity. Responsiveness, assessed in cataract patients (n = 120) before and after surgery, was good for all three scales (effect sizes >1). CONCLUSIONS: The IND-VFQ33 is a psychometrically sound measure of vision function addressing a gap in patient defined measures of vision function developed in populations living in low income countries.

Item Type: Article
Faculty and Department: Faculty of Public Health and Policy > Dept of Health Services Research and Policy
Faculty of Public Health and Policy > Dept of Global Health and Development
Faculty of Infectious and Tropical Diseases > Dept of Clinical Research
Faculty of Epidemiology and Population Health > Dept of Non-Communicable Disease Epidemiology
Research Centre: The International Centre for Evidence in Disability
International Centre for Eye Health
PubMed ID: 15834097
Web of Science ID: 228444600027
URI: http://researchonline.lshtm.ac.uk/id/eprint/13757

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