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Beatriz Redondo1, Jesús Vera1, Antonio Luque-Casado2

  • 1Department of Optics, Faculty of Sciences, University of Granada, Granada, Spain.

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Summary

Sustained attention tasks affect ocular accommodation microfluctuations and reaction times over time. Lower accommodation stability predicts reduced behavioral performance, but results show low repeatability between sessions.

Keywords:
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Area of Science:

  • Ophthalmology and Cognitive Neuroscience

Background:

  • Sustained attention is crucial for many tasks, yet its impact on ocular functions like accommodation is not fully understood.
  • Understanding the interplay between visual attention, ocular dynamics, and cognitive performance is vital for optimizing human efficiency.

Purpose of the Study:

  • To investigate the time-on-task effects on ocular accommodation during sustained attention.
  • To explore the relationship between ocular accommodation, cardiac autonomic regulation, and behavioral performance.
  • To assess the inter-session repeatability of these measurements.

Main Methods:

  • 25 university students performed a 10-minute psychomotor vigilance task at 50 cm.
  • Ocular accommodation was measured using a WAM-5500 autorefractor.
  • Heart rate variability and reaction time were also recorded.

Main Results:

  • No significant time-on-task effect was found for the lag of accommodation.
  • Microfluctuations of accommodation and reaction time increased progressively over time.
  • Microfluctuations of accommodation predicted behavioral performance; lower stability correlated with reduced performance.

Conclusions:

  • Accommodation microfluctuations are sensitive to time-on-task during sustained attention.
  • Reduced accommodative stability may be linked to impaired behavioral performance, potentially due to shared neural mechanisms.
  • Low to moderate inter-session repeatability suggests cautious interpretation of results across different measurement periods.