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Comparative results between standard and bitoric nomograms for astigmatism correction.

V M Sheludchenko1, T Fadeykina

  • 1New Line Vision Ophthalmology Research Centre, Moscow, Russia. nlvision@online.ru

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|April 24, 2001
PubMed
Summary

Bitoric laser eye surgery for mixed astigmatism reduced the need for repeat procedures compared to standard monotoric treatments. This excimer laser correction offers improved outcomes for astigmatism.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Mixed astigmatism presents challenges for accurate refractive correction.
  • Excimer laser photoablation is a common surgical approach for correcting refractive errors.

Purpose of the Study:

  • To compare the efficacy of bitoric nomograms versus standard monotoric procedures for excimer laser correction of mixed astigmatism.
  • To evaluate the re-ablation rates associated with each surgical nomogram.

Main Methods:

  • A comparative study involving 46 eyes with mixed astigmatism undergoing intrastromal photoablation with the Nidek EC-5000 excimer laser.
  • Two groups were analyzed: one treated with bitoric nomograms (28 eyes) and another with monotoric nomograms (18 eyes).

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Main Results:

  • The bitoric group showed a lower average residual cylinder (1.49 D) and sphere (-0.57 D) after 6 months.
  • Re-ablations were required in 25% of the bitoric group cases, compared to 44% in the monotoric group.

Conclusions:

  • Bitoric ablations demonstrate a reduced frequency of re-treatment for astigmatism correction compared to standard monotoric procedures.
  • This suggests bitoric nomograms may offer more predictable outcomes in mixed astigmatism correction.