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Validation of the DYOP visual acuity test.

Liat Gantz1, Dinah Paritzky1, Inbar Wunch1

  • 1Department of Optometry and Vision Science, Hadassah Academic College, Haneviim 37, Jerusalem 91010, Israel.

Journal of Optometry
|November 18, 2022
PubMed
Summary

The dynamic optotype (DYOP) visual acuity test shows promise but is less effective than static letter charts for detecting astigmatism. Further research is needed before recommending DYOP for routine clinical use.

Keywords:
Astigmatic defocusDYOPDynamic visual acuityLetter chartRepeatabilityValidationVisual acuity

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • The dynamic optotype (DYOP) visual acuity (VA) test utilizes motion detection, differing from traditional element-resolution charts.
  • DYOP has been proposed as a potential tool for routine clinical visual acuity assessment.

Purpose of the Study:

  • To evaluate the validity, repeatability, and subjective preference of the DYOP test compared to a static letter chart.
  • To assess the utility of the DYOP test in detecting astigmatic defocus.

Main Methods:

  • Visual acuity was measured three times for 103 participants using both DYOP and letter charts.
  • Repeatability was assessed within two weeks for 75 participants, who also provided subjective feedback.
  • The impact of induced astigmatism on VA measurements was evaluated using various charts, including DYOP.

Main Results:

  • DYOP and letter charts showed minimal mean difference (0.02 logMAR), with 81% of measurements within one line.
  • DYOP demonstrated better within-subject standard deviation and repeatability between sessions compared to letter charts.
  • Participants found the DYOP test more frustrating, with a majority preferring the static letter chart; DYOP was least affected by induced astigmatism.

Conclusions:

  • While DYOP offers good repeatability, its clinical significance is limited by wide agreement limits and poorer performance in detecting uncorrected astigmatism.
  • The DYOP test's utility for routine clinical determination of refractive error is questionable.
  • Static letter charts remain a preferred method for visual acuity testing in clinical settings.