PURPOSE: To describe 7 patients who developed ectasia following laser in situ kerato-mileusis (LASIK). SETTING: Instituto de la Visión, Buenos Aires, Argentina. METHODS: In this retrospective study of 7 patients, visual acuity, refraction, pachymetry, and corneal topography were examined before and after the refractive procedure and the occurrence of ectasia. RESULTS: Two of the 7 patients required penetrating keratoplasty. Ectasia developed within a mean of 1.02 years +/- 0.31 (SD). The clinical evolution of ectasia and the potential physiopathogenic causes of ectasia are described. CONCLUSION: Ectasia should be considered a potential complication of LASIK that is closely related to corneal thickness, but another variable, the optical zone diameter, should also be considered.
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Argento et al. (2001) studied this question.