Validity and Reliability of the Turkish Version of the Glaucoma Quality of Life-15 Scale
Yücel Öztürk1, Alev Özçelik Köse1, Sevcan Balcı1, Özgül Öztürk21Department of Ophthalmology, University of Health Sciences, Haydarpaşa Numune Research and Training Hospital, İstanbul, Türkiye2Department of Physiotherapy and Rehabilitation, Acibadem Mehmet Ali Aydinlar University, Faculty of Health Sciences, İstanbul, Türkiye
INTRODUCTION: Our aim was to translate the Glaucoma Quality of Life-15 Scale (GLQ-15) into Turkish and assess the reliability and validity of the adapted scale.
METHODS: This was a cross-sectional study. One hundred and twenty-two with the primary open-angle glaucoma were evaluated using the Turkish version of the Glaucoma Quality of Life-15 and National Eye Institute Visual Function Questionnaire-25 (NEI-VFQ-25). Internal consistency and test-retest reliability at a 2-week interval were evaluated. Floor and ceiling effects and factor analysis was performed to test the validity.
RESULTS: Cronbach’s alpha values were ranged from 0.65 to 0.95 which indicates that the internal consistency values are moderate to excellent and intraclass correlation coefficients were ranged from 0.85 to 0.95 between test and retest assessments. The Turkish version of the Glaucoma Quality of Life-15 is negatively and moderate to strongly correlated with the scale and the NEI-VFQ-25, as expected.
DISCUSSION AND CONCLUSION: The Turkish version of the GLQ-15 is a valid and reliable instrument to evaluate the level of quality of life in patients with glaucoma. Our results support the potential usefulness of this questionnaire in clinical practice.
Manuscript Language: English