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Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 22 — Nov. 15, 2013
  • pp: 4747–4749

Effect of correction of aberration dynamics on chaos in human ocular accommodation

Karen M. Hampson, Matthew P. Cufflin, and Edward A. H. Mallen  »View Author Affiliations

Optics Letters, Vol. 38, Issue 22, pp. 4747-4749 (2013)

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We used adaptive optics to determine the effect of monochromatic aberration dynamics on the level of chaos in the accommodation control system. Four participants viewed a stationary target while the dynamics of their aberrations were either left uncorrected, defocus was corrected, or all aberrations except defocus were corrected. Chaos theory analysis was used to discern changes in the accommodative microfluctuations. We found a statistically significant reduction in the chaotic nature of the accommodation microfluctuations during correction of defocus, but not when all aberrations except defocus were corrected. The Lyapunov exponent decreased from 0.71±0.07D/s (baseline) to 0.55±0.03D/s (correction of defocus fluctuations). As the reduction of chaos in physiological signals is indicative of stress to the system, the results indicate that for the participants included in this study, fluctuations in defocus have a more profound effect than those of the other aberrations. There were no changes in the power spectrum between experimental conditions. Hence chaos theory analysis is a more subtle marker of changes in the accommodation control system and will be of value in the study of myopia onset and progression.

© 2013 Optical Society of America

OCIS Codes
(330.5370) Vision, color, and visual optics : Physiological optics
(330.7322) Vision, color, and visual optics : Visual optics, accommodation

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: July 30, 2013
Revised Manuscript: October 4, 2013
Manuscript Accepted: October 7, 2013
Published: November 12, 2013

Virtual Issues
Vol. 9, Iss. 1 Virtual Journal for Biomedical Optics

Karen M. Hampson, Matthew P. Cufflin, and Edward A. H. Mallen, "Effect of correction of aberration dynamics on chaos in human ocular accommodation," Opt. Lett. 38, 4747-4749 (2013)

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