Table 2 Comparison of postoperative visual acuity and refractive errors in eyes that had transepithelial PRK or off-flap Epi-LASIK

 Sphere

0.21 ± 0.33

−0.50, 1.00

0.33 ± 0.46

−0.50, 1.25

.218

 Cylindrical

−0.43 ± 0.30

−1.00, 0.00

−0.48 ± 0.39

−1.50, 0.00

.584

 SE

−0.01 ± 0.35

−0.88, 0.88

0.08 ± 0.42

−0.88, 1.00

.311

UDVA (logMAR)

−0.05 ± 0.09

−0.20, 0.20

− 0.04 ± 0.08

−0.10, 0.20

.326

CDVA (logMAR)

−0.06 ± 0.06

−0.10, 0.10

− 0.05 ± 0.06

−0.10, 0.10

.522

Efficacy index

1.13 ± 0.16

0.79, 1.26

1.11 ± 0.19

0.79, 1.41

.733

Safety index

1.15 ± 0.12

1.00, 1.26

1.14 ± 0.13

0.89, 1.41

.631