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Magnetically adjustable intraocular lens.

Michael Wayne Matthews1, Harry Conrad Eggleston, Steven D Pekarek

  • 1University of Missouri-Rolla, St. Louis, MO 65409, USA.

Journal of Cataract and Refractive Surgery
|December 13, 2003
PubMed
Summary

This study introduces a novel magnetic adjustment mechanism for adjustable intraocular lenses (IOLs). This innovation offers a noninvasive solution for correcting refractive errors after surgery, potentially benefiting pediatric patients and adults.

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Development of a repeatedly adjustable intraocular lens.

Journal of cataract and refractive surgeryยท2003
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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Materials Science

Background:

  • Adjustable intraocular lenses (IOLs) aim to correct refractive errors post-surgery.
  • Current methods may require additional surgical intervention.
  • Pediatric and adult patients have evolving visual needs.

Purpose of the Study:

  • To develop a noninvasive magnetic adjustment mechanism for variable-focus IOLs.
  • To enable repeated and reversible focus adjustments.
  • To provide a solution for postoperative refractive errors.

Main Methods:

  • Fabrication and testing of mechanically adjustable IOLs.
  • Incorporation of samarium and cobalt rare-earth magnets into poly(methyl methacrylate) (PMMA) optics.
  • Leaching studies to assess magnet stability and operational force testing for adjustment torque.

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Main Results:

  • Successful production of prototype IOLs with rare-earth magnetic inserts.
  • Magnet stability confirmed with minimal leaching (max 5 ppm after 32 days).
  • External magnetic fields achieved successful lens adjustments with torques exceeding 0.6 ounce inch.

Conclusions:

  • Magnetically adjustable IOLs offer a viable, noninvasive method to correct refractive errors without further surgery.
  • The repeatable adjustment capability is promising for pediatric patients and changing adult visual needs.
  • This technology addresses common challenges in IOL implantation and patient vision correction.