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Visual Function and Driving Performance Under Different Lighting Conditions in Older Drivers: Preliminary Results

Jingzhen Yang1,2, Enas Alshaikh1, Deyue Yu3

  • 1Center for Injury Research and Policy at the Abigail Wexner Research Institute, Nationwide Children's Hospital, Columbus, OH, United States.

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Older drivers experience significant vision changes affecting night driving. This study found visual function impacts driving performance more at night, especially with glare, highlighting risks for older drivers.

Keywords:
driving simulationdriving simulatorfunctional visionglaremesopicnighttime drivingolder driversphotopicvisual functions

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Area of Science:

  • Ophthalmology and Vision Science
  • Gerontology
  • Transportation Safety

Background:

  • Age-related vision decline is a critical factor in nighttime driving accidents among older adults.
  • The precise impact of varying light conditions on vision and driving performance in this demographic is not well understood.

Purpose of the Study:

  • To investigate the relationship between visual function and driving performance in drivers aged 60 and above.
  • To assess these relationships across three distinct lighting conditions: daytime (photopic), nighttime (mesopic), and nighttime with glare, using a high-fidelity driving simulator.

Main Methods:

  • Participants (N=20, age 60+) underwent visual function tests including visual acuity (VA), contrast sensitivity function (CSF), and visual field map (VFM).
  • Simulated driving performance metrics (speed, lane position, reaction time) were recorded under photopic, mesopic, and mesopic with glare conditions.
  • Pearson correlations were used to analyze associations between visual function metrics (e.g., area under the log CSF) and driving performance.

Main Results:

  • Reduced visual acuity and contrast sensitivity were linked to poorer driving performance, including increased speed variability and lane position deviations, particularly under nighttime and glare conditions.
  • Impaired visual field function correlated with slower speeds, increased speed variability, and longer reaction times during nighttime driving.
  • Specific visual function deficits showed significant associations with driving impairments under mesopic and glare conditions, underscoring the heightened risk at night.

Conclusions:

  • Visual function significantly influences driving performance in older adults, with diminished capacity under low light and glare posing greater risks.
  • These findings suggest that age-related vision changes have a differential impact on driving safety depending on lighting conditions.
  • Further research with larger cohorts is recommended to validate these preliminary findings and inform safety interventions.