PURPOSE: To assess flap thickness and the performance of the Nidek MK-2000 microkeratome during laser in situ keratomileusis (LASIK). METHODS: Three hundred seventy consecutive eyes of patients undergoing LASIK had the depth of flaps measured via subtractive pachymetry. All flaps were created using two different model numbers of the Nidek MK-2000 microkeratome. Both 130-microm and 160-microm depth plates were evaluated. Microkeratome-induced complications were also recorded. RESULTS: Buttonhole flaps and free flaps were not seen in this study. One short flap occurred and suction could not be obtained in two eyes. The mean flap thickness obtained using the 130-microm depth plate for model number 121 was 129 +/- 21.8 microm. The mean flap thickness obtained using the 160-microm depth plate for model number 121 was 150 +/- 29.6 microm. The mean flap thickness obtained using the 130-microm depth plate for model number 65 was 152 +/- 25 microm. The mean flap thickness obtained using the 160-microm depth plate for model number 65 was 173 +/- 26.9 microm. CONCLUSION: The Nidek MK-2000 microkeratome is safe and creates flaps of predictable thickness.
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