Risk factors for corneal ectasia after LASIK.
Ophthalmology
; 113(9): 1618-22, 2006 Sep.
Article
em En
| MEDLINE
| ID: mdl-16949446
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 OUTCOMEMEASURES:
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<0.0001).CONCLUSIONS:
A risk score may help in the prediction of patients who are at risk of experiencing corneal ectasia after LASIK. A prospective clinical study is needed to assess the validity of these risk factors.
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Base de dados:
MEDLINE
Assunto principal:
Complicações Pós-Operatórias
/
Córnea
/
Doenças da Córnea
/
Ceratomileuse Assistida por Excimer Laser In Situ
Tipo de estudo:
Etiology_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Humans
Idioma:
En
Revista:
Ophthalmology
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Arábia Saudita