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Less is more: optimal recording time for measuring the steady-state accommodative response.

Beatríz Redondo1, Jesús Vera1, Rubén Molina1

  • 1Claro (Clinical and Laboratory Applications of Research in Optometry) Research Group, Department of Optics, Faculty of Sciences, University of Granada, Granada, Spain.

Clinical & Experimental Optometry
|November 29, 2021
PubMed
Summary

Determining the optimal recording time for steady-state accommodation measurements is crucial. A 30-second interval reliably assesses accommodative magnitude, while 60 seconds is sufficient for variability, using the WAM-5500 autorefractor.

Keywords:
Autorefractorrecording timereliabilitysteady-state accommodation

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Steady-state accommodation assessment is vital in clinical and lab settings.
  • Current methods using open-field autorefractors lack standardized test durations.
  • Optimizing test duration is essential for efficiency and reliability.

Purpose of the Study:

  • To determine the optimal recording duration for assessing accommodative response magnitude and variability.
  • To establish standardized procedures for steady-state accommodation testing.
  • To enhance the clinical utility of binocular open-field autorefractors.

Main Methods:

  • The study involved 84 healthy undergraduate students.
  • Dynamic accommodative responses were measured using the Grand Seiko WAM-5500 autorefractor.
  • Measurements were taken at 500 cm, 40 cm, and 20 cm for 90 seconds, analyzing 10s, 30s, 60s, and 90s intervals.

Main Results:

  • Excellent reliability (ICC > 0.90) for accommodative magnitude was observed for 30s, 60s, and 90s intervals.
  • Including the 10s interval moderately reduced reliability and increased mean differences.
  • Excellent reliability (ICC: 0.95-0.96) was found for accommodative variability using 60s and 90s intervals.

Conclusions:

  • A 30-second recording time is sufficient for accurately assessing the magnitude of steady-state accommodation.
  • A 60-second recording time is adequate for evaluating the variability of the accommodative response.
  • These findings support standardization of steady-state accommodation assessment with the WAM-5500 autorefractor.