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Related Experiment Videos

Worst-Fechner biconcave minus power phakic iris-claw lens.

P U Fechner1, I Haubitz, W Wichmann

  • 1Department of Ophthalmology, Robert Koch Hospital, Hannover-Gehrden, Germany.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|April 15, 1999
PubMed
Summary

This study evaluated the Worst-Fechner iris-claw lens for high myopia correction. While effective, it caused significant endothelial cell loss, leading to its discontinuation.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Biomedical Engineering

Background:

  • High myopia presents significant visual challenges.
  • Phakic intraocular lenses (IOLs) offer a surgical correction option.
  • The Worst-Fechner biconcave minus power iris-claw lens was used for phakic eye implantation.

Purpose of the Study:

  • To evaluate the long-term efficacy and safety of the Worst-Fechner iris-claw lens for high myopia correction.
  • To assess refractive outcomes and corneal endothelial cell density changes post-implantation.

Main Methods:

  • Implantation of 127 phakic IOLs in 70 patients with high myopia (mean spherical equivalent -14.29 D).
  • Follow-up examinations up to 8 years, assessing refractive error and visual acuity.
  • Corneal endothelial density estimation using specular microscopy and the Karickhoff method.

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Main Results:

  • Achieved refractive correction within +/- 1.00 D in 75% of eyes.
  • Spectacle-corrected visual acuity improved postoperatively but decreased by year 8.
  • Significant correlation between endothelial cell loss and patient age, anterior chamber depth, and IOL power.

Conclusions:

  • The Worst-Fechner lens effectively corrected high myopia with stable refractive results.
  • A significant progressive reduction in endothelial cell density occurred in 13.4% of eyes.
  • This lens design is no longer in clinical use due to safety concerns.