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Related Experiment Videos

Does over-accomodation occur when using aircraft head-up displays?

J S Wolffsohn1, G K Edgar, H E Stone

  • 1Department of Optometry and Vision Sciences, University of Melbourne, Parkville, Victoria, Australia.

Aviation, Space, and Environmental Medicine
|July 23, 1999
PubMed
Summary

Cognitive demand, not head-up displays, causes over-accommodation. Increased cognitive load and forward-looking infrared (FLIR) imagery negatively impacted task performance and accommodation response in a simulated flight environment.

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Area of Science:

  • Ophthalmology
  • Human Factors Engineering
  • Aerospace Medicine

Background:

  • The role of head-up displays (HUDs) in causing over-accommodation remains debated.
  • Previous studies often used unrealistic simulations and cognitively demanding tasks, potentially confounding results.
  • Short working distances in prior experiments may also influence accommodation responses.

Purpose of the Study:

  • To investigate whether head-up displays (HUDs) or cognitive task demand primarily causes over-accommodation.
  • To assess the impact of cognitive load and forward-looking infrared (FLIR) imagery on ocular accommodation and flight task performance.
  • To determine if HUD use in a realistic simulated environment affects accommodation.

Main Methods:

  • A realistic simulated aircraft flying task was employed to evaluate ocular accommodation and performance.

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  • Cognitive task load was systematically increased, including the use of forward-looking infrared (FLIR) imagery.
  • Measurements included accommodative response, response times, detection rates, tracking accuracy, and head-up display control.

    • Main Results:

    • Over-accommodation was minimal (0.17+/-0.03D) and occurred only with high cognitive load and FLIR imagery.
    • Increased cognitive load and FLIR significantly slowed response times for target detection.
    • Task performance metrics, including detection rate, tracking accuracy, and pitch ladder control, were negatively affected by increased cognitive demand.

    Conclusions:

    • Virtual head-up display (HUD) use in a simulated aircraft environment did not adversely affect ocular accommodation.
    • Significant inward shifts in accommodation were observed with increased cognitive demand and FLIR imagery.
    • Cognitive workload, rather than the HUD itself, appears to be the primary driver of accommodative changes.