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Diode laser thermal keratoplasty to correct hyperopia.

Uri Rehany1, Elina Landa

  • 1Department of Ophthalmology, Nahariya Medical Center, P.O. Box 21, 22100 Nahariya, Israel. rehany@naharia.health.gov.il

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|February 7, 2004
PubMed
Summary

Diode laser thermal keratoplasty (DTK) effectively corrected hyperopia with good long-term results. Further refinement of nomograms is needed for optimal outcomes in this refractive surgery.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Laser Technology

Background:

  • Hyperopia correction remains a significant challenge in refractive surgery.
  • Diode laser thermal keratoplasty (DTK) offers a potential solution for hyperopic correction.

Purpose of the Study:

  • To evaluate the long-term efficacy, predictability, stability, and safety of DTK for hyperopia correction.
  • To assess DTK's effectiveness in different degrees of hyperopia and for inducing monovision.

Main Methods:

  • DTK was performed on 24 eyes across three groups: high hyperopia, low hyperopia, and presbyopia for monovision.
  • Treatment involved varying numbers of coagulation spots and treatment zone diameters (6-mm, 7-mm, 8-mm).
  • Minimum follow-up duration was 18 months.

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Main Results:

  • Significant mean reductions in cycloplegic refraction were observed: 5.00 D (high hyperopia), 1.75 D (low hyperopia), and 3.25 D (presbyopia).
  • Uncorrected visual acuity improved substantially in hyperopic groups, while near UCVA improved in the presbyopia group.
  • Best spectacle-corrected visual acuity was restored within 3 months for all treated eyes.

Conclusions:

  • DTK demonstrated effectiveness, safety, predictability, and stability for hyperopia correction.
  • Improvements in nomograms for laser energy, treatment zone diameter, and spot count are recommended for enhanced outcomes.