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Psychometric properties of the national eye institute refractive error correction quality-of-life questionnaire among Iranian patients
Qazvin Research Center for Social Determinants of Health, Qazvin University of Medical Sciences, Qazvin, Iran.
Qazvin Research Center for Social Determinants of Health, Qazvin University of Medical Sciences, Qazvin, Iran.
Department of Health Education, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Department of Ophthalmology, University Hospital of Alexandroupolis, Alexandroupolis, Greece.
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2013 (English)In: Oman Journal of Ophthalmology, ISSN 0974-620X, E-ISSN 0974-7842, Vol. 6, no 1, 37-43 p.Article in journal (Refereed) Published
Abstract [en]

Background and Aim:

To evaluate the psychometric properties of the national Eye Institute refractive error correction quality of life questionnaire (NEI-RQL-42) among Iranian patients with refractive errors.

Materials and Methods:

Two samples of patients (n1 = 296, n2 = 95) were consecutively selected from the eye clinic of the Boo-Ali Hospital, Qazvin. A forward-backward procedure was conducted to translate and cross-culturally adapt the Iranian version of the NEI-RQL-42. A homogeneity, stability, and reliability test was conducted for the first sample after a two-week interval. Convergent validity was computed using the correlation between the NEI-RQL-42 subscale scores, National Eye Institute-Visual Functioning Questionnaire (NEI-VFQ-25), and the Short Form-36 (SF-36). Furthermore, Known-group analysis was performed, to determine the discriminant validity between the subgroups of patients with hyperopia, emmetropia, and myopia. Responsiveness to clinical change was tested by administering NEI-RQL-42 on the second sample that was scheduled for surgery.

Results:

Homogeneity was satisfactory with the Cronbach’s alpha coefficients ranging between 0.70 and 0.92. The 13 subscales of the NEI-RQL-42 showed a considerable stability in intra-class-correlation (ICC) ranging between 0.70 and 0.89. Positive correlation coefficients were found among all subscales of the NEI-RQL-42 and the other quality-of-life instruments (NEI-VFQ-25 and SF-36). The NEI-VFQ-25 displayed excellent discriminant validity to differentiate the subgroups of patients, and was found to be responsive to change after the surgical correction at three months.

Conclusions:

The Iranian version of the NEI-RQL-42 is a valid and reliable instrument to assess refractive error correction quality-of-life in Iranian patients. Moreover this questionnaire can be used to evaluate the effectiveness of interventions in patients with refractive errors.

Place, publisher, year, edition, pages
2013. Vol. 6, no 1, 37-43 p.
Keyword [en]
Methodology, NEI-RQL-42, quality of life, refractive error, validity
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:hj:diva-22672DOI: 10.4103/0974-620X.111911Local ID: HHJADULTISOAI: oai:DiVA.org:hj-22672DiVA: diva2:678601
Available from: 2013-12-12 Created: 2013-12-12 Last updated: 2013-12-13Bibliographically approved

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Citation style
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