Femtosecond thin-flap laser assisted in situ keratomileusis for correction of post-penetrating keratoplasty ametropia: long-term outcome

Table 2 Refractive outcome of the eyes undergoing myopic correction

Variable	Pre (N = 15)		Month 12 (N = 15)		P	Month 81 (N = 13)		P From Baseline
Variable	Mean ± SD	Median	Mean ± SD	Median		Mean ± SD	Median	P From Baseline
Sphere	-2.1 ± 1.8	-2	-0.08 ± 0.6	0.0	< 0.001	0.04 ± 1.25	0.0	0.002†
Cylinder	-4.9 ± 1.5	-5.50	-1.50 ± 0.8	-1.50	< 0.001	-2.73 ± 1.8	-3.00	0.001†
SE	-4.5 ± 1.5	-4.12	-0.86 ± 0.8	-0.87	< 0.001	-1.33 ± 1.2	-1.00	< 0.001†
CDVA	0.21 ± 0.11	0.22	0.18 ± 0.16	0.15	0.043	0.15 ± 0.11	0.15	0.037‡
UDVA	0.47 ± 0.16	0.39	0.37 ± 0.16	0.3	0.03	0.4 ± 0.17	0.3	0.04‡

CDVA: corrected distance visual acuity; UDVA: Uncorrected distance visual acuity † Based on paired t-test. ‡ Based on Wilcoxon singed-rank test. SD: Standard deviation; SE: Spherical equivalent

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