Visual Activities Questionnaire: Assessment of subscale validity for cataract surgery outcomes
Vijaya K Gothwal, Thomas A Wright, Ecosse L Lamoureux, Konrad Pesudovs
JOURNAL OF CATARACT AND REFRACTIVE SURGERY | ELSEVIER SCIENCE INC | Published : 2009
PURPOSE: To examine the psychometric properties of the Visual Activities Questionnaire (VAQ) and each of its subscales in a modern cataract population using Rasch analysis and if flawed, to revise the VAQ and create a valid measure that maximizes its measurement properties. SETTING: Flinders Eye Centre, Flinders Medical Centre, Adelaide, Australia. METHODS: Patients with cataract in 1 or both eyes drawn from the surgical waiting list were mailed the 33-item VAQ for self-administration. The following were examined for the entire questionnaire and each subscale: whether items measured a single construct (unidimensionality), the behavior of response categories, the ability to differentiate betw..View full abstract
Awarded by National Health and Medical Research Council, Canberra, Australia
Supported in part by National Health and Medical Research Council, Canberra, Australia, Centre of Clinical Research Excellence grant 264620.