Table 2.

High-order aberrations before and after LASIK with flaps cut by using the mechanical microkeratome or femtosecond laser.

	All High		Sphere		Coma		Trefoil
	Mechanical	Femtosecond	Mechanical	Femtosecond	Mechanical	Femtosecond	Mechanical	Femtosecond
	4 mm Pupil
Pre-LASIK	0.13 ± 0.04	0.14 ± 0.07	0.04 ± 0.02	0.04 ± 0.02	0.06 ± 0.03	0.07 ± 0.06	0.06 ± 0.03	0.06 ± 0.05
1 month	0.17c ± 0.04	0.19a ± 0.06	0.06 ± 0.03	0.07a ± 0.04	0.08a ± 0.04	0.11 ± 0.06	0.08 ± 0.04	0.07 ± 0.04
5 years	0.19c ± 0.05	0.18 ± 0.05	0.06a ± 0.04	0.08c ± 0.03	0.10c ± 0.04	0.11 ± 0.06	0.09a ± 0.05	0.07 ± 0.04
	5 mm Pupil
Pre-LASIK	0.26 ± 0.09	0.26 ± 0.09	0.12 ± 0.05	0.12 ± 0.04	0.14 ± 0.10	0.14 ± 0.11	0.11 ± 0.06	0.10 ± 0.06
1 month	0.33b ± 0.09	0.38c ± 0.11	0.16b ± 0.06	0.19c ± 0.06	0.18fa ± 0.11	0.23fa ± 0.12	0.13 ± 0.06	0.12 ± 0.10
5 years	0.37b ± 0.13	0.37b ± 0.09	0.19db ± 0.08	0.20b ± 0.07	0.20a ± 0.11	0.23a ± 0.12	0.16 ± 0.11	0.12 ± 0.08
	6 mm Pupil
Pre-LASIK	0.47 ± 0.22	0.46 ± 0.18	0.26 ± 0.09	0.26 ± 0.09	0.27 ± 0.23	0.26 ± 0.20	0.18 ± 0.10	0.16 ± 0.09
1 month	0.66c ± 0.21	0.76c ± 0.25	0.40c ± 0.15	0.43c ± 0.16	0.37 ± 0.26	0.46b ± 0.26	0.20 ± 0.10	0.22 ± 0.20
5 years	0.70c ± 0.19	0.75c ± 0.22	0.44ec ± 0.15	0.46c ± 0.13	0.35 ± 0.22	0.44a ± 0.26	0.23 ± 0.16	0.21 ± 0.17

LASIK - laser in situ keratomileusis

Aberrations expressed as root-mean-squared wavefront error, µm, mean ± standard deviation.

Different from pre-LASIK: ^ap≤0.045, ^bp≤0.01, ^cp≤0.001 (Bonferroni-adjusted for 2 comparisons)

Different from 1 month: ^dp=0.044, ^ep=0.008

Different between treatments: ^fp=0.035 (Bonferroni-adjusted for 3 comparisons)