April 2011
Volume 52, Issue 14
Free
ARVO Annual Meeting Abstract  |   April 2011
Preliminary Investigation On The Dynamics Of Accommodation In An Ex Vivo Accommodation Simulator: Natural Versus Refilled Lens
Saramati Narasimhan; Altricia Wilson; James Nearing; Christian Billotte; Jason Watling; Fabrice Manns; Robert C. Augusteyn; Arthur Ho; Jean-Marie A. Parel
Author Affiliations & Notes
  • Saramati Narasimhan
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Univ of Miami Miller School of Medicine, Miami, Florida
    Biomedical Optics and Laser Laboratory, Department of Biomedical Engineering, Univ of Miami, College of Engineering, Coral Gables, Florida
  • Altricia Wilson
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Univ of Miami Miller School of Medicine, Miami, Florida
  • James Nearing
    Department of Physics, University of Miami, Coral Gables, Florida
  • Christian Billotte
    Service d'Ophtalmologie, CHU Caen, University of Caen, Caen, France
  • Jason Watling
    Brien Holden Vision Institute, Sydney, Australia
    Adventus Technology (Australia) Pty Ltd, Sydney, Australia
  • Fabrice Manns
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Univ of Miami Miller School of Medicine, Miami, Florida
    Biomedical Optics and Laser Laboratory, Department of Biomedical Engineering, Univ of Miami, College of Engineering, Coral Gables, Florida
  • Robert C. Augusteyn
    Vision Cooperative Research Centre, Sydney, Australia
  • Arthur Ho
    Brien Holden Vision Institute, Sydney, Australia
    School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
  • Jean-Marie A. Parel
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Univ of Miami Miller School of Medicine, Miami, Florida
    Vision Cooperative Research Centre, Sydney, Australia
  • Footnotes
    Commercial Relationships  Saramati Narasimhan, None; Altricia Wilson, None; James Nearing, None; Christian Billotte, None; Jason Watling, Adventus Technology (Australia) Pty Ltd (E), Patent (P); Fabrice Manns, None; Robert C. Augusteyn, None; Arthur Ho, None; Jean-Marie A. Parel, None
  • Footnotes
    Support  NIH 2R01EY14225; Australian Federal Government CRC Program (Vision CRC); NIH P30EY14801; Florida Lions Eye Bank; Research to Prevent Blindness; Henri and Flore Lesieur Foundation (JMP)
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 852. doi:
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      Saramati Narasimhan, Altricia Wilson, James Nearing, Christian Billotte, Jason Watling, Fabrice Manns, Robert C. Augusteyn, Arthur Ho, Jean-Marie A. Parel; Preliminary Investigation On The Dynamics Of Accommodation In An Ex Vivo Accommodation Simulator: Natural Versus Refilled Lens. Invest. Ophthalmol. Vis. Sci. 2011;52(14):852.

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Abstract

Purpose: : To evaluate the feasibility of quantifying the dynamics of accommodation in a lens stretcher (EVAS) in a natural (NL) and refilled (RL) lens.

Methods: : The accommodative apparatus of a human eye (age=14yr, PMT 72hr) was mounted in EVAS and stretched to a maximum radial displacement of 2.5mm. After settling for 20s, the load was released at a rate of 0.5mm/s. The coronal view during release was recorded using an operation microscope coupled with a video system. Ciliary and capsule diameters were measured on 146 frames over the 5s release period. At the end of the experiment, the lens was extracted, the empty capsule refilled with a siloxane-based polymer, and the experiment was repeated on the refilled lens.

Results: : The change in capsule diameter (CD) was greater for the RL than the NL (0.66mm compared to 0.45mm respectively, over 4s). Fitting to an offset exponential decay model, the accommodative change in CD of the NL exhibited a greater exponential curvature (CD=9.43+0.699e-0.633t) than the RL (CD=8.17+1.61e-0.183t). This suggests that the NL has a marked viscous component in its mechanical properties while the RL is much closer to being elastic. A similar response was seen for the change in diameter of polymer outline in the RL.

Conclusions: : The dynamic response of accommodation can be quantified on an EVAS using video-image analysis. Quantitative and qualitative differences can be seen in the accommodation response of NL and RL on the EVAS. The NL exhibits a visco-elastic type response while the lens refilled with siloxane-based polymer exhibits a more elastic behaviour.Support: NIH 2R01EY14225; Australian Federal Government CRC Program (Vision CRC); NIH P30EY14801; Florida Lions Eye Bank; Research to Prevent Blindness; Henri and Flore Lesieur Foundation (JMP).

Keywords: accommodation • presbyopia 
© 2011, The Association for Research in Vision and Ophthalmology, Inc., all rights reserved. Permission to republish any abstract or part of an abstract in any form must be obtained in writing from the ARVO Office prior to publication.
Copyright © 2024 Association for Research in Vision and Ophthalmology.
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