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Related Experiment Videos

Screening for corneal topographic abnormalities before refractive surgery

S E Wilson1, S D Klyce

  • 1Department of Ophthalmology, University of Texas Southwestern Medical Center at Dallas 75235-9057.

Ophthalmology
|January 1, 1994
PubMed
Summary

Corneal topography screening is crucial before refractive surgery, as many patients exhibit abnormalities like contact lens-induced warpage or keratoconus not visible on standard examination. This screening improves surgical safety and outcomes.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Topography

Background:

  • Corneal topography is vital for assessing refractive surgery candidates.
  • Undetected corneal abnormalities can compromise surgical outcomes.

Purpose of the Study:

  • To evaluate corneal topography in patients seeking myopia correction via refractive surgery.
  • To identify prevalence of abnormalities impacting refractive surgery suitability.

Main Methods:

  • Prospective evaluation of 106 eyes from 53 patients using a topographic modeling system.
  • Categorization of patients based on refractive correction: contact lenses (rigid/soft), glasses, or none.
  • Analysis of topographic data for abnormalities like irregular astigmatism and warpage.

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Main Results:

  • 33% of eyes (35/106) showed abnormal corneal topography.
  • Contact lens wearers (especially rigid lens users) exhibited higher rates of corneal warpage (38%).
  • A notable incidence of keratoconus (5.7%) was diagnosed, exceeding general population rates.

Conclusions:

  • Preoperative corneal topographic screening is essential for refractive surgery safety and efficacy.
  • Identifying contact lens-induced warpage and occult ectatic disease improves surgical planning.
  • Topographic screening can help eliminate unpredictable variables, potentially improving outcomes for procedures like radial keratotomy and photorefractive keratectomy.