Risk Factors for Corneal Ectasia after LASIK

Khalid F. Tabbara, Amgad A. Kotb

Research output: Contribution to journalArticle

Abstract

Purpose: To establish a grading system that helps identify high-risk individuals who may experience corneal ectasia after LASIK. Design: Retrospective, comparative, interventional case series. Participants: One hundred forty-eight consecutive patients (148 eyes) were included in this study. Thirty-seven patients who underwent LASIK at other refractive centers experienced corneal ectasia in 1 eye after LASIK. One hundred eleven eyes of 111 patients who underwent successful LASIK during the same period were age and gender matched and served as controls. Intervention: All patients underwent preoperative and postoperative topographic analysis of the cornea. The follow-up period in both groups of patients ranged from 2 to 5 years, with a mean follow-up of 3.6 years. All patients underwent LASIK for myopia (spherical equivalent, -4.00 to -8.00 diopters). Main Outcome Measures: Corneal keratometry, oblique cylinder, pachymetry, posterior surface elevation, difference between the inferior and superior corneal diopteric power, and posterior best sphere fit (BSF) over anterior BSF were given a grade of 1 to 3 each. An ectasia grading system was established, and the cumulative risk score was assessed. Results: Patients who had a grade of 7 or less showed no evidence of corneal ectasia, whereas 16 (59%) of 27 patients who had a grade of 8 to 12 had corneal ectasia. Twenty-one (100%) of 21 patients with a grade of more than 12 had corneal ectasia after LASIK (P

Original languageEnglish (US)
Pages (from-to)1618-1622
Number of pages5
JournalOphthalmology
Volume113
Issue number9
DOIs
StatePublished - Sep 2006

ASJC Scopus subject areas

  • Ophthalmology

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