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Tonic accommodation predicts closed-loop accommodation responses.

Chunming Liu1, Stefanie A Drew2, Eric Borsting3

  • 1Western University of Health Sciences, College of Optometry, Pomona, CA, United States.

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|November 7, 2016
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Summary
This summary is machine-generated.

This study reveals a strong link between tonic accommodation (TA) and the eye's steady-state accommodation response (AR) during visual tasks. Near work did not significantly alter TA or its connection to AR.

Keywords:
Accommodation responseTA-adaptationTonic accommodationVergence

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Physiological Optics

Background:

  • Tonic accommodation (TA) is a crucial baseline ocular focusing state.
  • Understanding the relationship between TA and the dynamic accommodation response (AR) is vital for visual function.
  • Near work can influence accommodative behavior, but its effect on TA adaptation is not fully understood.

Purpose of the Study:

  • To investigate the association between tonic accommodation (TA) and steady-state closed-loop accommodation response (AR).
  • To examine if near work induces adaptation in tonic accommodation.
  • To explore the role of vergence in binocular accommodation responses.

Main Methods:

  • Objective measurement of accommodation parameters using an open-field infrared auto-refractor.
  • Assessment of tonic accommodation in a dark environment.
  • Analysis of correlations between TA and closed-loop AR under various monocular and binocular viewing conditions and near work tasks.

Main Results:

  • A significant positive correlation was found between baseline tonic accommodation and closed-loop accommodation response across different viewing distances and tasks.
  • The ratio of AR change to TA change was approximately 0.3D per 1D.
  • No significant near work-induced TA adaptation was observed, and TA adaptation did not correlate with AR during reading.

Conclusions:

  • Open-loop tonic accommodation is strongly associated with closed-loop accommodation response in various visual tasks.
  • Binocular viewing conditions weaken the TA-AR correlation, suggesting a role for vergence compensation.
  • Near work adaptation of tonic accommodation was not evident in this study population.