Validation of the Spanish version of the Low Vision Quality of Life Questionnaire
Pérez-Mañá, Luis (Hospital de la Esperanza)
Cardona, Genis (Universitat Politècnica de Catalunya)
Pardo Cladellas, Yolanda (Institut Hospital del Mar d'Investigacions Mèdiques)
Pérez-Mañá, Clara (Institut Germans Trias i Pujol. Hospital Universitari Germans Trias i Pujol)
Amorós Martínez, Jaume (Universitat Oberta de Catalunya)
González-Sanchís, Luis (Institut Català de la Retina)
Wolffsohn, James S. (Aston University)
Antón López, Alfonso (Universitat Internacional de Catalunya)
Universitat Autònoma de Barcelona

Data:	2021
Resum:	To validate the Spanish Low Vision Qualify of Life (SLVQOL) questionnaire, a quality of life instrument specifically designed for patients with visual impairment, and evaluate its psychometric properties. The study included 170 visually impaired patients and 195 healthy subjects. Participants were administered the SLVQOL, the NEI VFQ-25, and the EQ 5D-5L questionnaires. Reliability, test-retest reproducibility, feasibility, and construct validity of the SLVQOL were assessed. The Generalized Partial Credit Model was used to fit the data and the performance of each item was characterized using category response curves and item information. The reliability of the SLVQOL was 0. 981 (95% CI: 0. 978-0. 985). Test-retest reproducibility was good (ρ = 0. 864, P <. 001). A cut-off point of 105 or 106 was optimal to detect visual impairment, with a sensitivity of 95. 4% and a specificity of 91. 8%. Construct validity was shown by the corresponding convergence or divergence correlations between the score of the SLVQOL and its dimensions and the overall and partial scores of the NEI VFQ-25 and the EQ 5D-5L. Item response theory analysis showed discrimination and information parameters ranging from 0. 539 to 3. 063 and from -1. 894 to 1. 074, respectively. The SLVQOL was able to quantitatively assess and identify differences in the quality of life among patients with visual impairment and normal subjects. The evaluated psychometric properties suggest that this tool has excellent validity, internal consistency, and reproducibility, but may benefit from a reduction of the number of items.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Generalized Partial Credit Model ; Item response theory ; Low vision ; Patient reported outcomes ; Psychometric properties ; Quality of life ; Validation
Publicat a:	Journal of optometry, Vol. 15 (april 2021) , p. 199-209, ISSN 1989-1342

DOI: 10.1016/j.optom.2021.01.004
PMID: 33879374

11 p, 970.8 KB

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