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A. Benitez, R. Velasco, C. Carmona, A. Babayan, O. Baca; Incidence and Risk Factors to Develop Corneal Ectasia After Refractive Surgery. Invest. Ophthalmol. Vis. Sci. 2008;49(13):2923.
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To determine the incidence of corneal ectasia, suspicious cases and the risk factors related with, in patients were refractive surgery was performed.
A retrospective, longitudinal and observational study. Patient's records who underwent refractive surgery with any kind of the known techniques (LASEK, PRK or LASIK) in the period between May 1 2005 to May 31, 2007 in the Cornea department of our institution were reviewed. Ectasia post surgery was defined as: BCVA 20/30 or worst, central pachometry ≤ 400 µm, ablation depth > 76 µm, icreasing of astigmatism > 1.25 D., residual myopia > 2.0 D., topographic findings of asymmetric corneal toricity > 1.40 D.Suspicious case post surgery was defined as: < 400 µm, BCVA 20/25 or better. Ablation depth > 76 µm and < 100 µm, and without the other criteria for ectasia.
1170 eyes out of f 604 patients were operated on. 9 cases were included in the suspicious group. The spherical equivalent was -5.47 D, the average ablation diameter zone was 5.5 mm, the average of ablation deepness was 95.2 µm, The preoperative central pachometry was 557.9 µm, and the postoperative was 378.1 µm. 2 eyes were diagnosed with ectasia (0.17%). The spherical equivalent was -6.50 D, the average ablation diameter zone was 5.25 mm, the average of ablation deepness was 105 µm, The preoperative central pachometry was 539.5 µm, and the postoperative was 389 µm.
The incidence of ectasia was 0.17% . The most important risk factor found in this study was ablation > 100 microns.Keywords: corneal ectasia, refractive surgery, incidence, risk factors.
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