Karmona L, et al. – The astigmatism induced surgically (SIA) by spherical hyperopic laser in situ keratomileusis (H–LASIK) versus myopic laser in situ keratomileusis (M–LASIK) in nonastigmatic eyes were compared in this study. A consistent trend was observed toward more SIA in H–LASIK and in higher refractive error correction. In H–LASIK larger optical zones induce more SIA and in M–LASIK smaller ones caused it.