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ORIGINAL ARTICLE
Year : 2013  |  Volume : 6  |  Issue : 1  |  Page : 37-43

Psychometric properties of the national eye institute refractive error correction quality-of-life questionnaire among Iranian patients


1 Qazvin Research Center for Social Determinants of Health, Qazvin University of Medical Sciences, Qazvin, Iran
2 Department of Health Education, Baqiyatallah University of Medical Sciences, Tehran, Iran
3 Department of Ophthalmology, University Hospital of Alexandroupolis; Eye Institute of Thrace, Alexandroupolis, Greece
4 School of Health Sciences, Jönköping University, Jönköping, Sweden

Correspondence Address:
Amir H Pakpour
Qazvin Research Center for Social Determinants of Health, Qazvin University of Medical Sciences, Qazvin
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-620X.111911

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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.


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