May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Incidence and Risk Factors to Develop Corneal Ectasia After Refractive Surgery
Author Affiliations & Notes
  • A. Benitez
    Cornea, Fundacion hospital Nstra Sra de la Luz, Mexico, Mexico
  • R. Velasco
    Cornea, Fundacion hospital Nstra Sra de la Luz, Mexico, Mexico
  • C. Carmona
    Cornea, Fundacion hospital Nstra Sra de la Luz, Mexico, Mexico
  • A. Babayan
    Cornea, Fundacion hospital Nstra Sra de la Luz, Mexico, Mexico
  • O. Baca
    Cornea, Fundacion hospital Nstra Sra de la Luz, Mexico, Mexico
  • Footnotes
    Commercial Relationships  A. Benitez, None; R. Velasco, None; C. Carmona, None; A. Babayan, None; O. Baca, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 2923. doi:https://doi.org/
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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. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To determine the incidence of corneal ectasia, suspicious cases and the risk factors related with, in patients were refractive surgery was performed.

Methods: : 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.

Results: : 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.

Conclusions: : 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.

Keywords: refractive surgery: complications • clinical (human) or epidemiologic studies: risk factor assessment • refractive surgery 
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