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Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
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Published on: March 3, 2023

Short-term adaptive modification of dynamic ocular accommodation.

Shrikant R Bharadwaj1, Indu Vedamurthy, Clifton M Schor

  • 1Indiana University School of Optometry, Bloomington, Indiana 47405, USA. srbharad@indiana.edu

Investigative Ophthalmology & Visual Science
|March 4, 2009
PubMed
Summary

This study demonstrates that the neural control of accommodation can adapt to changing visual demands in young adults. Accommodative step response dynamics showed short-term adaptation, particularly when increasing demands, suggesting a recalibration of the visual system.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vision Science

Background:

  • Indirect evidence suggests neural control of accommodation adapts to age-related biomechanical changes.
  • Direct demonstration of this adaptive capability has been lacking.

Purpose of the Study:

  • To demonstrate short-term adaptation of accommodative step response dynamics.
  • To investigate adaptation to optically induced changes in neuromuscular demands.

Main Methods:

  • 15 young adults (18-34 years) underwent a double-step adaptation paradigm with induced blur changes.
  • Accommodative step response dynamics (peak velocity, acceleration, latency) were measured before and after training.

Main Results:

  • Peak velocity and acceleration increased after adaptation to increasing blur demands and decreased with decreasing blur demands.
  • Adaptive changes generalized to different response magnitudes and were negatively correlated with preadaptation dynamics.
  • Response latency decreased irrespective of adaptation direction.

Conclusions:

  • Short-term adaptive changes in accommodative dynamics are inducible in young adults.
  • Adaptation showed a directional bias towards increasing accommodative effort.