Table 4 Comparison of ocular higher-order aberrations and contrast sensitivity in eyes that had transepithelial PRK or off-flap Epi-LASIK

 Spherical

0.053 ± 0.120

0.001, 0.581

0.077 ± 0.206

0.001, 1.084

.348^*

 Coma

0.118 ± 0.200

0.007, 0.963

0.156 ± 0.245

0.007, 1.069

.209^*

 Trefoil

0.148 ± 0.205

0.019, 0.796

0.142 ± 0.150

0.021, 1.160

.802^*

 3 cpd

1.76 ± 0.13

1.49, 1.93

1.74 ± 0.12

1.49, 2.08

.326

 6 cpd

2.03 ± 0.16

1.70, 2.29

2.02 ± 0.17

1.70, 2.29

.670

 12 cpd

1.73 ± 0.18

1.40, 1.99

1.72 ± 0.18

1.40, 1.99

.744

 18 cpd

1.31 ± 0.18

0.96, 1.55

1.30 ± 0.18

0.81, 1.55

.689

 3 cpd

1.73 ± 0.13

1.49, 1.93

1.70 ± 0.11

1.49, 1.93

.155

 6 cpd

2.01 ± 0.14

1.70, 2.29

2.01 ± 0.17

1.70, 2.29

1.000

 12 cpd

1.69 ± 0.19

1.40, 1.99

1.68 ± 0.20

1.40, 1.99

.714

 18 cpd

1.25 ± 0.21

0.81, 1.55

1.26 ± 0.22

0.96, 1.55

.821