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Topographic-guided LASIK enhancement treats high levels of corneal primary coma

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STOCKHOLM, Sweden — A topographic-guided LASIK enhancement procedure makes corrections of the second order safely and effectively, significantly reducing primary coma, a physician said at the European Society of Cataract and Refractive Surgeons meeting.

David Pablo Piñero Llorens, MD, and colleagues studied 34 eyes of 29 patients who underwent a topographic-guided LASIK enhancement performed with the Esiris excimer laser (Schwind) to correct residual myopia and astigmatism or hyperopia and astigmatism.

All patients had a high preoperative level of primary coma aberration; the root mean square (RMS) for primary coma was more than 0.5 µm for a 6-mm pupil. The researchers used the ORK-CAM software to calculate and program the ablation design.

They found statistically significant changes at 1 month, with a reduction of the total RMS, astigmatic RMS, primary coma RMS and negativization of the primary spherical aberration coefficient.

"Corneal wavefront-guided enhancements with the ORK-CAM system are safe and effective for the reduction of the corneal primary coma induced by previous decentered keratorefractive procedures," Dr. Llorens said.