Measurement validity of the Low Vision Independence Measure (LVIM)

• Autores: Theresa M. Smith, Shilpa Krishnan, Ickpyo Hong, Timothy Reistetter
• Localización: American Journal of Occupational Therapy, ISSN 0272-9490, Vol. 73, Nº. 3, 2019
• Idioma: inglés
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• Resumen

  • OBJECTIVE. This study’s objective was to test the psychometrics of Smith’s (2013) Low Vision Independence Measure (LVIM) using the Rasch model.

    METHOD. A cohort design was used with 93 participants receiving occupational therapy for low vision. Confirmatory factor analysis (CFA) with a parceling approach was used to test the LVIM factors and Rasch analysis to examine item-level psychometrics.

    RESULTS. Participants’ average age was 78.9 yr (standard deviation = 12.1), and the majority were female (72.8%) with macular degeneration (62.3%). The CFA revealed two measurement factors: visual field or scotoma (n = 28) and visual acuity (n = 24). We removed six misfitting items, and the two factors of the revised LVIM demonstrated good rating scale function, good internal consistency (person reliability: visual field, .87; visual acuity, .90), good precision (person strata: visual field, 3.91; visual acuity, 4.40), no ceiling or floor effects, and no differential item functioning.

    CONCLUSION. The revised LVIM demonstrates good psychometrics on the Rasch model and can be used as a valid outcome measure in low vision rehabilitation.