Correction of myopia and astigmatism by laser in situ keratomileusis basedon corneal topography (TopoLink LASIK)

Patients and methods. We treated 114 patients (eyes) with myopia of -1 to 6 D and astigmatism of 0 to -4 D (group 1), and 89 patients (eyes) with myop ia of -6.1 to -12 D and astigmatism of 0 to -4 D (group 2). All treatments were calculated on the basis of corneal topography measured with the Orbsca n II system. The Keracor 217 excimer laser and the Hansatome microkeratome were used. Results. At 3 months,51 patients in the low myopia group and 40 patients in the high myopia group were available for examination. In the low thigh) my opia group, 96.1% (75.0%) were within +/-0.50 D of emmetropia, and uncorrec ted visual acuity was 20/20 or better in 82.4% (62.5%), 20/25 or better in 98.0% (70.0%), and 20/40 or better in 100% (95.0%). A loss of two or more l ines of spectacle-corrected visual acuity occurred in 3.9% of the low and 5 .0% of the high myopia group. In low myopia, spectacle-corrected visual acu ity was 20/12.5 or better in 5.9% preoperatively and in 13.7% at three mont hs and 20/15 or better in 37.3% and 47.1%, respectively (P=0.0002 and P=0.0 1). Conclusions. LASIK based on corneal topography showed very high efficacy in low and moderate myopia with astigmatism,and maximal visual acuity could e ven be improved in some cases. There was somewhat less precision in high my opia with astigmatism.