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Innovations
Use of the light-adjustable lens to correct astigmatism after cataract surgery
  1. Arturo Chayet1,
  2. Chris Sandstedt2,
  3. Shiao Chang2,
  4. Paul Rhee2,
  5. Barbara Tsuchiyama2,
  6. Robert Grubbs3,
  7. Dan Schwartz4
  1. 1Codet Vision Institute, Tijuana, Mexico
  2. 2Calhoun Vision, Inc., Pasadena, California, USA
  3. 3California Institute of Technology, Pasadena, California, USA
  4. 4University of California, San Francisco, California, USA
  1. Correspondence to Dr Daniel M Schwartz, Department of Ophthalmology, University of California, Box 0730, San Francisco, CA 94127-0730, USA; dsucsf{at}yahoo.com

Abstract

Aim To determine if residual cylindrical refractive error after cataract surgery can be adjusted using the light-adjustable lens (LAL).

Methods The LAL is a photosensitive silicone intraocular lens whose power can be adjusted post-operatively using UV light at 365 nm. A digital light delivery device (DLD) is used to adjust LAL power in situ to correct residual refractive errors non-invasively. Profiles developed to correct residual cylindrical and spherical errors were tested on five patients, with postoperative toric refractive errors of 1.25–1.75 D. At 2 weeks post-implantation, best corrected visual acuity (BCVA), uncorrected visual acuity (UCVA) and residual refractive errors were measured.

Results Toric error was reduced in each of the patients and refractions remained stable for the 9 month follow-up period. Achieved spherical equivalent manifest refraction (MRSE) was within 0.25 D of targeted emmetropia. All five patients improved their UCVA to ≥20/25 (≤0.1 logarithm of the minimum angle of resolution (LogMAR)) and maintained their BCVA.

Conclusion The LAL can be adjusted postoperatively to correct residual astigmatism.

  • Light adjustable lens
  • astigmatism
  • intraocular lens
  • cataract
  • refractive error
  • vision
  • optics and refraction
  • treatment surgery
  • treatment other

https://doi.org/10.1136/bjo.2009.164616

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    Footnotes

    • Funding Funding for this study was provided by Calhoun Vision, Inc.

    • Competing interests CS, SC and BT are employees and stockholders of Calhoun Vision, Inc. RG and DS are stockholders of Calhoun Vision.

    • Patient consent Obtained.

    • Ethics approval Ethics approval was provided by Mexican Ministry of Health and the Institutional Review Board at Codet Vision Institute (Tijuana, Mexico).

    • Provenance and peer review Not commissioned; externally peer reviewed.

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