Microkeratome complications of laser in situ keratomileusis

Purposes To evaluate the incidence, types, and outcome of microkeratome com plications that occur during laser in situ keratomileusis (LASIK). Design: Retrospective, noncomparative, case series. Participants: Three thousand nine hundred ninety-eight eyes that underwent primary LASIK by four surgeons between November 1996 and August 1998 at a u niversity-based refractive center. Methods: All cases with significant microkeratome complications leading to abandonment of the LASIK procedure were identified and reviewed. Main Outcome Measures: Incidence of complications, change in best corrected visual acuity (BCVA), change in refractive error, and types of complicatio n. Results: There were 27 complications leading to abandonment of the LASIK pr ocedure of 3998 eyes. The overall rate of microkeratome complication was 1 in 150 (0.68%), but it was 1 in 77 (1.3%) in the surgeons' first 1000 eyes, decreasing to 1 in 250 (0.4%) in the last 1000 eyes. Of the 24 planned bil ateral cases, 15 complications (63%) happened on the first operated eye. Tw enty-six of 27 eyes (96%) recovered to within one line of preoperative BCVA , and one eye lost two lines. At last examination before any repeat refract ive procedures, spherical equivalent manifest refraction returned to within 1 diopter (D) of its preoperative value in 18 of 19 eyes (95%), and astigm atism in 16 of 19 eyes (84%) returned to within 1 D of its preoperative val ue. Sixteen of 27 eyes (59%) had repeat LASIK. Two eyes had complications a t repeat LASIK, one of which led to abandonment of the LASIK procedure for a second time. Conclusions: There is a significant learning curve in the use of the microk eratome. If ablation is not performed, flap complications rarely lead to si gnificant visual loss and generally do not result in a change in refractive error. (C) 2000 by the American Academy of Ophthalmology.