Visual Acuity Testing: Feedback Affects Neither Outcome nor Reproducibility, but Leaves Participants Happier

Michael Bach and Kerstin Schäfer

PLOS ONE, 2016, vol. 11, issue 1, 1-11

Abstract: Assessment of visual acuity is a well standardized procedure at least for expert opinions and clinical trials. It is often recommended not giving patients feedback on the correctness of their responses. As this viewpoint has not been quantitatively examined so far, we quantitatively assessed possible effects of feedback on visual acuity testing. In 40 normal participants we presented Landolt Cs in 8 orientations using the automated Freiburg Acuity Test (FrACT, 0.5). The comfort ranking clearly differed, by 2 steps on the Likert scale: the condition (A)–no feedback–was on average “slightly uncomfortable”, the other three conditions were “slightly comfortable” (p

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0147803

DOI: 10.1371/journal.pone.0147803

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