Table 4.

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

	Transepithelial PRK		Off-flap Epi-LASIK		P Value
	Mean ± SD	Range	Mean ± SD	Range
HOAs (um)
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*
CS photopic
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
CS mesopic
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

HOA Higher-order aberration, CS Contrast sensitivity. ^*Mann-Whitney U test