To compare the influence of four different microkeratomes on myopic LASIK outcomes.
Retrospective, observational cohort study. We compared 134 eyes treated with the IntraLase 60 kHz, 112 eyes treated with the Femto LDV Z6, 206 eyes treated with the FS200 and 98 eyes treated with the Hansatome zero compression microkeratome. All eyes were operated using the same surgical protocol with the same excimer laser (Wavelight Allegretto) and were allocated in refraction-matched groups. Uncorrected distance visual acuity, best corrected distance visual acuity and residual refraction were evaluated 1 and 7 days, 1 and 3 months postoperatively.
One day and one week postoperatively, uncorrected distance visual acuity was significantly lower in the FS200 group compared to others (P=0.0001). This difference disappeared at the 1- and 3-month postoperative visits. Significant differences were found among groups in terms of safety index (P=0.0001), residual sphere (P=0.0001) and residual cylinder (P=0.02) at the 3-months postoperative visit. No significant differences were found in corrected distance visual acuity or efficacy index.
According to our results, a slight delay in visual restoration after FS200 LASIK surgery might be expected. This delay was statistically significant at 1 day and 1 week postoperatively, but there were no differences from the 1-month visit onwards.