Validation of the spanish version of the low vision quality of life questionnaire
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- dc.contributor.author Pérez Mañá, Luis
- dc.contributor.author Cardona, Genis
- dc.contributor.author Pardo Cladellas, Yolanda
- dc.contributor.author Pérez Mañá, Clara
- dc.contributor.author Amorós Martínez, Jaume
- dc.contributor.author González Snachís, Luis
- dc.contributor.author Wolffsohn, James S.
- dc.contributor.author Antón López, Alfonso
- dc.date.accessioned 2021-09-30T06:17:51Z
- dc.date.available 2021-09-30T06:17:51Z
- dc.date.issued 2022
- dc.description.abstract Purpose: 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. Methods: 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. Results: 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. Conclusion: 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.
- dc.format.mimetype application/pdf
- dc.identifier.citation Pérez-Mañá L, Cardona G, Pardo-Cladellas Y, Pérez-Mañá C, Amorós-Martínez J, González-Sanchís L, Wolffsohn JS, Antón A. Validation of the spanish version of the low vision quality of life questionnaire. J Optom. 2022;15(3):199-209. DOI: 10.1016/j.optom.2021.01.004
- dc.identifier.doi http://dx.doi.org/10.1016/j.optom.2021.01.004
- dc.identifier.issn 1888-4296
- dc.identifier.uri http://hdl.handle.net/10230/48531
- dc.language.iso eng
- dc.publisher Elsevier
- dc.relation.ispartof J Optom. 2022;15(3):199-209
- dc.rights © 2021 Spanish General Council of Optometry. Published by Elsevier España, S.L.U. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
- dc.rights.accessRights info:eu-repo/semantics/openAccess
- dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/
- dc.subject.keyword Generalized Partial Credit Model
- dc.subject.keyword Item response theory
- dc.subject.keyword Low vision
- dc.subject.keyword Patient reported outcomes
- dc.subject.keyword Psychometric properties
- dc.subject.keyword Quality of life
- dc.subject.keyword Validation
- dc.title Validation of the spanish version of the low vision quality of life questionnaire
- dc.type info:eu-repo/semantics/article
- dc.type.version info:eu-repo/semantics/publishedVersion