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Graefe's Archive for Clinical and Experimental Ophthalmology

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01.09.2011 | Basic Science

The dynamics of practice effects in an optotype acuity task

verfasst von: Sven P. Heinrich, Katja Krüger, Michael Bach

Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology | Ausgabe 9/2011

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Abstract

Background

Practice-related improvements of performance are common in many areas of visual processing. There is preliminary evidence that this is also the case for standard optotype acuity tasks. The present study was designed to confirm and quantify the effect of practice under different feedback conditions and to track the dynamics of practice over several sessions.

Methods

Subjects completed a total of 56 runs of a computer-based acuity test with randomly oriented Landolt C optotypes, split evenly over four sessions at intervals of 1 week. Half of the subjects received feedback indicating the correct response.

Results

Over the course of the sessions, the test outcomes increased significantly by 0.11 logMAR with feedback and by 0.055 logMAR without feedback. In addition to an increase in acuity over the first few runs of the first session, a major part of the practice effect with feedback occurred not during a session, but in between the first and the second session. Without feedback, the increase in acuity occurred mainly within the first half of the first session.

Conclusions

Feedback has a drastic effect on the magnitude and dynamics of the practice effect, which is not explained by simple familiarization with the test procedure. If feedback is not given, practice effects can be neglected in most clinical routine applications even when many test repetitions are performed. However, they may become relevant on a group level in clinical studies without an appropriate control.

Nur mit Berechtigung zugänglich

The ICO guidelines forbid feedback in studies that aim at comparing two different acuity tests, but do not mention feedback in the context of patient testing. The current ISO 8596 standard [31] refers to these guidelines.

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Titel: The dynamics of practice effects in an optotype acuity task
verfasst von: Sven P. Heinrich
Katja Krüger
Michael Bach
Publikationsdatum: 01.09.2011
Verlag: Springer-Verlag
Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology / Ausgabe 9/2011
Print ISSN: 0721-832X
Elektronische ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-011-1675-z

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The dynamics of practice effects in an optotype acuity task

Abstract

Background

Methods

Results

Conclusions

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Springer Medizin

Abstract

Background

Methods

Results

Conclusions

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