ArticleOphthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)2026
Psychometric Validation of a Short-Form Spanish Low Vision Quality of Life Questionnaire (SF-SLVQOL) Using Rasch Analysis: From 25 to 6 Items.
Article in Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionThe Spanish Low Vision Quality of Life Questionnaire (SLVQOL) assesses vision-related quality of life effectively but requires significant administration time. This study aimed to develop and validate a psychometrically robust short-form version (SF-SLVQOL) using Rasch analysis to reduce respondent burden while maintaining measurement precision in Spanish-speaking populations with visual impairment.
methodsData from the original SLVQOL validation study (n = 365; 170 visually impaired, 195 controls) were reanalysed using Partial Credit Model analysis in WINSTEPS. Items were systematically reduced through iterative removal based on point-biserial correlations (< 0.4) and misfit statistics (infit/outfit outside 0.7-1.3). The resulting SF-SLVQOL was evaluated for structural validity (unidimensionality, local independence, monotonicity), internal consistency (Cronbach's alpha), criterion validity (correlation with original SLVQOL), construct validity (convergent validity with NEI VFQ-25, known-groups validity across ICD-11 visual impairment categories), differential item functioning by gender and test-retest reliability.
resultsThe 6-item SF-SLVQOL demonstrated excellent unidimensionality (essential unidimensionality = 93.6%, variance explained = 79.3%), optimal internal consistency (α = 1.00) and high criterion validity (r = 0.95 with original SLVQOL). Convergent validity with the NEI VFQ-25 was confirmed (r = 0.69). The known-groups analysis showed significant discrimination between visual impairment levels (H = 132.67, p < 0.001). Person reliability (0.91) indicated the ability to distinguish 4.3 performance levels. Test-retest reliability was acceptable (ICC = 0.753; 95% CI: 0.569-0.864) with a repeatability limit of 4.89 points.
conclusionThe SF-SLVQOL successfully reduces administration time by 76% while maintaining robust psychometric properties, offering clinicians and researchers an efficient tool for assessing vision-related quality of life in Spanish-speaking populations.
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