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Related Experiment Videos

Undercorrection after excimer laser refractive surgery. Excimer Laser Group

R B Vajpayee1, C A McCarty, G F Aldred

  • 1Department of Ophthalmology, Melbourne Excimer Laser Group, University of Melbourne, Australia.

American Journal of Ophthalmology
|December 1, 1996
PubMed
Summary

Undercorrection after excimer laser surgery for myopia increases over time, especially in severe myopia cases. This can lead to significant vision loss, highlighting the need for careful surgical planning.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Excimer laser surgery is a common procedure for correcting myopia and myopic astigmatism.
  • Undercorrection, a refractive outcome less than intended, can impact visual outcomes.
  • Long-term incidence and associated factors of undercorrection require further investigation.

Purpose of the Study:

  • To investigate the incidence and correlations of undercorrection one year after excimer laser surgery for myopia or myopic astigmatism.

Main Methods:

  • A consecutive series of 645 eyes from 440 patients undergoing excimer laser surgery were analyzed.
  • Preoperative and 1, 3, 6, and 12-month postoperative examinations assessed visual acuity, refraction, and corneal clarity.
  • Statistical analysis identified factors associated with undercorrection and visual acuity loss.

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Main Results:

  • Undercorrection of -1.00 diopters or more increased from 10% at 1 month to 40% at 12 months post-surgery.
  • Higher preoperative myopia was significantly associated with increased undercorrection at 3, 6, and 12 months.
  • Loss of 2 or more lines of best-corrected visual acuity occurred in 38% of undercorrected eyes, with a higher risk in those with -1.00 D or more undercorrection.

Conclusions:

  • Undercorrection is more prevalent in patients with severe myopia and those undergoing simultaneous astigmatic correction.
  • Severe undercorrection is linked to a substantial risk of best-corrected visual acuity loss.
  • Topical corticosteroid treatment showed limited benefit in resolving undercorrection.