Subjective refractions determined by Dyop ® and LogMAR chart as fixation targets

Rita W. Sum (Corresponding Author), George C. Woo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

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
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.
Original languageEnglish
Number of pages8
JournalAnnals of Eye Science
Volume7
Publication statusPublished - 15 Dec 2022

Keywords

  • Dyop
  • dynamic optotype
  • visual acuity
  • subjective refraction

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