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Related Experiment Video

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Dynamic Visual Acuity test while walking or running on treadmill: Reliability and normative data.

Evi Verbecque1, Tamaya Van Criekinge1, Delphine Vanloot2

  • 1Department of Rehabilitation Sciences and Physiotherapy, Faculty of Medicine and Health Science, University of Antwerp, Antwerp, Belgium; Multidisciplinary Motor Centre Antwerp (M²OCEAN), University of Antwerp, Belgium.

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Summary
This summary is machine-generated.

This study establishes a reliable Dynamic Visual Acuity (DVA) test protocol for treadmill walking, providing normative data. Age influences visual acuity loss, highlighting the need for age-specific references in clinical practice.

Keywords:
AgeingDynamic visual acuity testNormative dataVestibular function test

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomechanics

Background:

  • Dynamic Visual Acuity (DVA) assessment is crucial for understanding visual performance during movement.
  • Establishing normative data and validating DVA protocols are essential for clinical application.
  • The influence of aging on visual acuity during dynamic tasks requires further investigation.

Purpose of the Study:

  • To establish normative reference data for a Dynamic Visual Acuity (DVA) test performed on a treadmill.
  • To assess the test-retest reliability and validity of the DVA protocol.
  • To determine the impact of age on visual acuity loss (VAL) during dynamic conditions.

Main Methods:

  • 171 healthy adults (20-77 years) underwent static (SVA) and dynamic visual acuity (DVA) testing at various treadmill speeds (3-9 km/h).
  • Intraclass correlation coefficients (ICC) were used to assess relative test-retest reliability for SVA and DVA.
  • Measurement errors, drop-out rates, and head movement frequencies (3D motion tracking) were analyzed to evaluate validity and age-related effects.

Main Results:

  • High consistency (ICC ≥ 0.89) was observed for both SVA and DVA measurements.
  • Visual acuity loss (VAL) was lower in younger participants (decades 3-4) at lower speeds (3-4 km/h).
  • Drop-out rates increased with walking speed, particularly in older adults, while head movement frequency remained consistent around 2 Hz.

Conclusions:

  • The developed Dynamic Visual Acuity (DVA) protocol is reliable and has established normative data.
  • The study identified age-related differences in visual acuity loss during dynamic tasks.
  • Further validation in patient populations, such as those with bilateral vestibulopathy, is recommended for clinical utility.