Journal article
Psychometric properties of visual functioning index using Rasch analysis
VK Gothwal, T Wright, EL Lamoureux, K Pesudovs
Acta Ophthalmologica | WILEY-BLACKWELL | Published : 2010
Abstract
Purpose:- The visual functioning index (VFI) was one of the first questionnaires developed using classical test theory to assess outcomes of cataract surgery. However, it was not Rasch-validated. The objective of this study was to examine the psychometric properties of the VFI using Rasch analysis in patients with cataract. Methods:- The 11-item VFI was self-administered to 243 patients (mean age 73.9years) drawn from a cataract surgery waiting list. We examined the response category thresholds, item fit statistics, differential item functioning and unidimensionality for the VFI and its three subscales. Results:- Category thresholds were ordered. The person separation and reliability were lo..
View full abstractGrants
Awarded by National Health and Medical Research Council (Canberra, Australia) Centre of Clinical Research
Awarded by National Health and Medical Research Council (Canberra, Australia)
Funding Acknowledgements
This work was supported in part by National Health and Medical Research Council (Canberra, Australia) Centre of Clinical Research Excellence Grant 264620. K.P. is supported by National Health and Medical Research Council (Canberra, Australia) Career Development Award 426765.