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Subjects/examiners/data analysis
Most subjects were students and lecturers of the Cologne School of Optometry. Pupillary distances varied from 56 to 74mm. Mean value was 62.25mm. None of the subjects showed manifest squint. All spectacle frames had been carefully fitted. Two subjects were wearing large-sized eyewear, making it impossible to attach the Visureal measuring clip to the subject's frame. For two other subjects, data on the Zeiss RVT printout were missing for unknown reasons. These four subjects were excluded from final data analysis.
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