Construct validation of the Spanish version of the Low Vision Quality of Life scale
DOI:
https://doi.org/10.22544/rcps.v44i02.05Keywords:
Quality of life, low vision, construct validityAbstract
Objective: To assess the construct validity of the LVQOL scale in Spanish. Metodology: Diagnostic test evaluation study that began with the cross-cultural adaptation of the scale, followed by an iterative analysis, which included the evaluation of the distribution of responses, and the threshold of item progression, the review of model fit, the study of the separation index and the exploration of differential functioning (DIF).. Results: The study included 62 individuals with low vision, averaging 54.67 years of age. Out of the participants, 64.52% were women and 58.06% had visual field alterations. The sample was heterogeneous. The Rasch analysis indicated good interrelation between the scale items. The visual functioning had more than two levels of measurement, and the categories had differentiated cut-off points with six response options. Item 20 exhibited a poor fit to the model, while items 9 and 16 demonstrated DIF. Item 21 was the most challenging, whereas item 15 was the simplest. Conclusions: The study's findings support the construct validity of the Spanish version of the LVQOL scale, as demonstrated by the 24 items and six response options.References
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