Table 3.

Epi-off versus epi-on after 2-year follow-up (mean ± SD).

	Epi-off	Epi-on	p value
Mean corneal thickness (µm)	501.41 ± 21.91	495.45 ± 43.16	0.10
K flat (D)	44.71 ± 3.03	46.44 ± 3.67	0.01∗
K steep (D)	47.76 ± 3.47	49.75 ± 3.47	0.01∗
Mean K (D)	46.16 ± 3.15	47.82 ± 4.06	0.08
BCVA (logMAR)	0.22 ± 0.12	0.27 ± 0.13	0.01∗
OSDI© (before and one-month later)	13.56 ± 2.15	11.26 ± 2.12	0.02

BCVA: best corrected visual acuity; OSDI: Ocular Surface Disease Index; ^∗Student's t-test for paired values.