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Related Experiment Videos

Accommodation and vergence require effort-to-see.

Ellie L Francis1, Bai-chuan Jiang, D Alfred Owens

  • 1Division of Ophthalmology, Children's Hospital of Philadelphia, Philadelphia, PA, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|June 17, 2003
PubMed
Summary

Attentional effort significantly impacts vision. Concentrating improves visual accuracy (accommodation and vergence), while "spacing-out" causes these functions to regress, highlighting the role of attention in visual perception.

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Area of Science:

  • Oculomotor control
  • Visual perception
  • Cognitive neuroscience

Background:

  • Nonsensory factors, such as effort-to-see, influence visual functions like accommodation and vergence.
  • Understanding these influences is crucial for comprehending visual exploration in 3D space.

Purpose of the Study:

  • To quantify the impact of "effort-to-see" on accommodation and vergence responses.
  • To investigate the role of attentional states in modulating oculomotor control.

Main Methods:

  • Nine volunteers viewed stimuli designed to isolate accommodation or vergence.
  • Oculomotor responses were recorded under two attentional conditions: "concentrate" and "space-out."

Main Results:

  • Both accommodation and vergence were accurate under the "concentrate" condition.

Related Experiment Videos

  • Under the "space-out" condition, oculomotor responses regressed towards their resting posture.
  • Individual variability in oculomotor responses was observed.

    • Conclusions:

    • Higher-level attentional factors critically influence accommodation and vergence.
    • Active exploration of the three-dimensional environment relies on these attentional modulations of visual functions.