Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/94957
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Title: Subjective refractions determined by Dyop ® and LogMAR chart as fixation targets
Authors: Sum, RW 
Woo, GC 
Issue Date: 15-Dec-2022
Source: Annals of eye science, 15 Dec. 2022, v. 7, 34, p.1-8
Abstract: Background: Dyop® is a dynamic optotype with a rotating and segmented visual stimulus. It can be used for visual acuity and refractive error measurement. The objective of the study was to compare refractive error measurement using the Dyop® acuity and LogMAR E charts.
Methods: Fifty subjects aged 18 or above with aided visual acuity better than 6/12 were recruited. Refractive error was measured by subjective refraction methods using the Dyop® acuity chart and LogMAR E charts and the duration of measurement compared. Thibo’s notation was used to represent the refractive error obtained for analysis.
Results: There was no significant difference in terms of spherical equivalent (M) (P=0.96) or J0 (P=0.78) and J45 (P=0.51) components measured using the Dyop® acuity and LogMAR E charts. However, subjective refraction measurement was significantly faster using the Dyop® acuity chart (t=4.46, P<0.05), with an average measurement time of 419.90±91.17 versus 452.04±74.71 seconds using the LogMAR E chart.
Conclusions: Accuracy of refractive error measurement using a Dyop® chart was comparable with use of a LogMAR E chart. The dynamic optotype Dyop® could be considered as an alternative fixation target to be used in subjective refraction.
Keywords: Dyop
Dynamic optotype
Visual acuity
Subjective refraction
Publisher: AME Publishing Company
Journal: Annals of eye science 
EISSN: 2520-4122
DOI: 10.21037/aes-22-17
Rights: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) (https://creativecommons.org/licenses/by-nc-nd/4.0/)
The following publication Sum, R. W., & Woo, G. C. (2022). Subjective refractions determined by Dyop ® and LogMAR chart as fixation targets. Annals of Eye Science, v.7 is available at https://dx.doi.org/10.21037/aes-22-17
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