Volume 5, Issue 1 (Continuously Updated 2022)                   Func Disabil J 2022, 5(1): 0-0 | Back to browse issues page

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Hakimzadeh Yazdi Z, Azimi Khorasani A, Riazi A. Validity and Version of the Vision-related Quality of Life Questionnaire. Func Disabil J 2022; 5 (1) : 57
URL: http://fdj.iums.ac.ir/article-1-184-en.html
1- Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran.
2- Refractive Errors Research Center, Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran.
3- Department of Optometry, Rehabilitation Research Center, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran. , abbas.riazi@gmail.com
Abstract:   (650 Views)
Background and Objectives: The vision-related quality of life (VRQoL) questionnaire has already been developed. However, some items of these instruments are not suitable for Iranian samples. This study aims to develop the Persian version of this questionaire to evaluate the functional vision of visually impaired Iranian people.
Methods: The VRQoL questionnaire was evaluated and 43 items were chosen as an initial questionnaire. Ten visually impaired people were interviewed to express their idea about the position and manner of expressing questions in the questionnaire. Some items were excluded and the remained items were given to 30 patients as well as some visual impairment specialists. Their opinions about the face validity of the questionnaire were used. The content validity of this instrument called the Iranian low vision questionnaire (ILVQ) was evaluated using Lawshe’s content validity ratio. To construct validity, factor analysis was used. Internal reliability was evaluated using Cronbach’s alpha coefficient.
Results: The reduction of psychometric items showed that three items should be eliminated and a 32-item questionnaire was produced as an Iranian low vision questionnaire (ILVQ). This local instrument has performance-based (13 items) and self-reported (19 items) sections with a five-point response scale. The psychometric evaluation showed an internal reliability of 96% by Cronbach’s alpha coefficient and an overall reliability and repeatability of 0.96 (P<0.001) by intraclass correlation coefficient (ICC). The test-retest reliability was obtained at 0.94 (P<0.001) to indicate the external reliability and stability of the instrument.
Conclusion: This instrument has high validity and reliability, which is a standard tool to assess the quality of life (QoL) among Iranian visually impaired people. Existing questionnaires around the world should be modified to add or remove some items due to advanced technologies.
Article number: 57
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Type of Study: Research | Subject: Optometry
Received: 2022/07/21 | Accepted: 2022/11/1 | Published: 2022/02/3

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