Validation of a questionnaire on distorsion perception among progressive addition lenses wearers

摘要

A new 50-item questionnaire is proposed to assess complaints related to distortion perception among progressive addition lens wearers. Three groups of subjects answered the questionnaire, 90 new wearers of PALs, 103 former wearers without change of prescription, and 85 with a change in their ophthalmic correction. After multitrait analysis to test scaling assumption, 45 questions were regrouped in 7 subscales. Internal consistency coefficients (Cronbach's alpha) were high, ranging from 0.81 to 0.96 for the total population and remain greater than 0.70 in the three groups of subjects. All subscales are moderately correlated with satisfaction of the subjects. These results suggest that the questionnaire on subjective perceived distortion in PAL wearers is acceptable, reliable, valid, and interpretable.