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Clinical Outcomes after LASIK in Myopic and Astigmatic Corrections - Comparison of the used Microceratomes

Pollack K., Kohlhaas M., Spörl E., Pillunat L. E.,
Universitätsklinikum Carl Gustav Carus, Klinik und Poliklinik für Augenheilkunde (Dresden)

Patients and Methods: A retrospective analysis was made of 126 eye surgeries on 66 patients (desired refraction: 0 dpt) conducted at the Dresden University Eye Clinic from June 2000 through April 2001. Pre- and postoperative uncorrected vision, best corrected vision, corneal thickness, residual tissue thickness, tension, and complications of surgery were taken into account. The average patient age was 32 years, ranging from 19 to 52 years of age. The average spherical equivalent was -6.23 dpt, ranging from 2.0 dpt to -11.5 dpt; the average astigmatism varied from -0.25 dpt to -3.75 dpt. The average corneal thickness was 542 µm, ranging from 461 µm to 630 µm. On average, the ablation was 76 µm deep (29 µm to 137 µm).
Results: Results of 75 surgeries using an Amadeus microkeratome (Fa. SIS) and of 51 surgeries using a Schwind keratome were compared. There were no significant differences in uncorrected postoperative vision sharpness, keratometer readings, or tension between the two groups. In 86.4% of the surgeries, corrected postoperative vision was the same or better than before Lasik surgery. In 17 of the surgeries, there was a decline in corrected vision sharpness of 2 lines or more. This was caused by macrostriae, eccentric ablation, central island, and uncorrectable postoperative astigmatism in 8.8% of the surgeries. In 4.8% of the surgeries, vision was further impaired by Sicca symptoms and retinal complications. Postoperative keratitis was observed in 10 cases.
Conclusions: The preceding results indicate no significant differences between the two microkeratomes.