Corneal Asphericity and Higher-Order Aberrations after FS-LASIK and Trans-PRK for Myopia

Table 3

Comparison of the corneal aberrations between FS-LASIK and Trans-PRK (mean ± SD, μm).

Groups	HOA	Vertical coma (Z3^−1)	Horizontal coma (Z3^1)	Spherical aberration (Z4^0)
Pre-FS-LASIK	0.42 ± 0.07	0.14 ± 0.10	0.11 ± 0.07	0.20 ± 0.06
Pre-Trans-PRK	0.41 ± 0.09	0.13 ± 0.11	0.14 ± 0.09	0.18 ± 0.07
value	0.763	0.505	0.063	0.087
Post-FS-LASIK	0.73 ± 0.14	0.38 ± 0.17	0.25 ± 0.17	0.37 ± 0.11
Post-Trans-PRK	0.72 ± 0.19	0.24 ± 0.15	0.26 ± 0.18	0.38 ± 0.15
value	0.830	0.001	0.801	0.080
Δ FS-LASIK	0.31 ± 0.25	0.24 ± 0.18	0.14 ± 0.16	0.17 ± 0.11
Δ Trans-PRK	0.31 ± 0.18	0.11 ± 0.15	0.12 ± 0.18	0.20 ± 0.15
value	0.530	0.006	0.785	0.063

HOA: higher-order aberration; SD: standard deviation; pre: preoperative, post: 6-month postoperative; Δ FS-LASIK = post-FS-LASIK – pre-FS-LASIK; Δ Trans-PRK = post-Trans-PRK – pre-Trans-PRK. .