Posters

Cross-cultural validation of Dutch version of quality of vision questionnaire and Rasch-analysis based questionnaire modification for assessment of negative dysphotopsia

Poster Details

First Author: N.Makhotkina THE NETHERLANDS

Co Author(s):    M. Nijkamp   T. Berendschot   B. van den Borne   M. Aelen   K. Pesudovs   R. Nuijts     

Abstract Details

Purpose:

To validate the Quality of Vision Questionnaire (QoV) in a Dutch population and to develop and validate the extended version of this questionnaire (ND-QoV) including negative dysphotopsia items.

Setting:

University Eye Clinic, Maastricht University Medical Centre, Maastricht, The The Netherlands

Methods:

The QoV was translated into Dutch according to the standardized methodology. Negative dysphotopsia items were constructed based on focus group interviews, literature review and clinical data. The questionnaire was completed by 404 subjects including contact lenses wears, patients with cataract and after cataract surgery. Rasch analysis was applied for evaluation of reliability and validity of the original and modified versions of QoV.

Results:

The frequency, severity and bothersome scales of the QoV and ND-QoV demonstrated a good measurement precision, good fit statistics for all but one item and a significant mistargeting of more than 1 logit. The item estimations were quite stable across the study groups, the scales were unidimensional and more 50% of variance was explained by the measurements. There was a positive correlation between the questionnaire scores and best corrected visual acuity (r=0.3, p<0.01). The quality of vision measured by all three scales was significantly poorer (p<0.01) in patients with negative dysphotopsia compared to asymptomatic pseudophakic patients.

Conclusions:

Dutch version of QoV questionnaire has shown a good psychometric properties comparable to the native version as well as good reliability and validity. Addition of negative dysphotopsia items is valuable modification for the reliable assessment of quality of vision in the pseudophakic patients.

Financial Disclosure:

None