Journal article
Optimizing measurement of vision-related quality of life: a computerized adaptive test for the impact of vision impairment questionnaire (IVI-CAT)
EK Fenwick, BS Loe, J Khadka, REK Man, G Rees, EL Lamoureux
Quality of Life Research | SPRINGER | Published : 2020
Abstract
Purpose: To compare the results from a simulated computerized adaptive test (CAT) for the 28-item Impact of Vision Impairment (IVI) questionnaire and the original paper–pencil version in terms of efficiency (main outcome), defined as percentage item reduction. Methods: Using paper–pencil IVI data from 832 participants across the spectrum of vision impairment, item calibrations of the 28-item IVI instrument and its associated 20-item vision-specific functioning (VSF) and 8-item emotional well-being (EWB) subscales were generated with Rasch analysis. Based on these calibrations, CAT simulations were conducted on 1000 cases, with ‘high’ and ‘moderate’ precision stopping rules (standard error of..
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Awarded by National Health and Medical Research Council
Funding Acknowledgements
Prof. Ecosse Lamoureux was supported by an Australian National Health and Medical Research Council (NHMRC) Senior Research Fellowship (#1045280). Dr Gwyn Rees was funded by an NHMRC Career Development Fellowship (#1061801). The funding organizations had no role in the design or conduct of this research or preparation of this manuscript. The Centre for Eye Research Australia receives Operational Infrastructure Support from the Victorian Government.