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Vision and Quality of Life: Development of Methods for the VisQoL Vision-Related Utility Instrument
- Source :
- Ophthalmic Epidemiology, Monash University
- Publication Year :
- 2008
- Publisher :
- Informa Healthcare, 2008.
-
Abstract
- Purpose To describe the methods and innovations used in constructing the VisQoL, a vision-related utility instrument for the health economic evaluation of eye care and rehabilitation programs. Methods The VisQoL disaggregates vision into six items. Utilities were estimated for item worst responses (the worst level for each item, with all other items at their best level) and VisQoL all-worst responses (all items at their worst level) using the time trade-off procedure. Time trade-off questions require people to imagine living a fixed number of years with a particular health condition and then indicate how many of those years of life they would be willing to trade to have perfect health. Where respondents indicated a health state was “worse than death” negative utilities were estimated. Time trade-off questions minimized the “focusing effect,” which occurs if respondents discount the fact that all other aspects of health are at their best when answering questions, by using pictorial and verbal aids. Results Item utilities were combined using a multiplicative model, and VisQoL model utilities placed on a scale where 0.00 and 1.00 represent full health and death, respectively. The VisQoL allows utilities to be calculated for a wide range of vision-related conditions. Conclusion The 6-item VisQoL has excellent psychometric properties and is specifically designed to be sensitive to vision-related quality of life. It is the first instrument to permit the rapid estimation of utility values for use in economic evaluations of vision-related programs.
- Subjects :
- economic evaluation
Psychometrics
Epidemiology
medicine.medical_treatment
Cost-Benefit Analysis
Applied psychology
Vision-related quality of life
Vision Disorders
Visual Acuity
Eye care
Time-trade-off
Quality of life (healthcare)
time trade-off
Sickness Impact Profile
Surveys and Questionnaires
medicine
Humans
Vision, Ocular
Cost–utility analysis
Rehabilitation
Cost–benefit analysis
business.industry
cost-utility analysis
Models, Theoretical
Ophthalmology
utility instrument
Economic evaluation
Quality of Life
Original Article
business
Visually Impaired Persons
Subjects
Details
- Language :
- English
- ISSN :
- 17445086 and 09286586
- Volume :
- 15
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Ophthalmic Epidemiology
- Accession number :
- edsair.doi.dedup.....925a4f330392caa3f0ae77565575073c