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Jens Buehren, Moritz Rössler, Thomas Kohnen; Evaluation of a questionnaire in German language to assess presbyopia correction methods. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):1366.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate a novel questionnaire translated into German language for the assessment of presbyopia correction methods.
The 18-item questionnaire originally designed by Gupta et al. (Contact Lens & Anterior Eye 30;2007:134-43) was translated from English into German and was adjusted to the local customs. The wording was checked for comprehensibility by interviewing several persons of different ages. The questionnaire was completed twice (repeat after 1-7 days) by 20 patients with monofocal intraocular lenses (IOLs), 20 presbyopic patients and 20 young normal control subjects. Rasch Analysis was used first of all to limit the rating-scale and subsequently to reduce the items. Discrimination ability between the different groups of subjects was assessed through receiver-operating characteristic (ROC) curve analysis. Bland-Altman statistics were used to assess test-retest reliability.
The 6-point rating-scale was reduced to a 3-point rating-scale after fit statistics were made use of; item reduction resulted in a 11-item questionnaire. After item reduction the coefficient of repeatability (COR) of the questionnaire score was 1,8 (59,6%) for questions with previously 6 different categories and 2,7 (58,4%) for questions with previously 4 categories.
The final 11-item version of the questionnaire shows a reliable, valid instrument in German language, that could be helpful to assess the subjective optical quality of near visual function.
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