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

Table 2

Asphericity (Q value) of the anterior corneal surface in FS-LASIK and Trans-PRK.

Dia. (mm)	Groups	Preoperative	1 month	3 months	6 months	value (group)	value (time)
6	FS-LASIK	−0.24 ± 0.07	0.61 ± 0.26	0.59 ± 0.25	0.56 ± 0.26	0.324	<0.001
	Trans-PRK	−0.27 ± 0.08	0.56 ± 0.30	0.53 ± 0.31	0.54 ± 0.30
7	FS-LASIK	−0.28 ± 0.08	0.61 ± 0.25	0.57 ± 0.24	0.55 ± 0.25	0.249	<0.001
	Trans-PRK	−0.30 ± 0.08	0.54 ± 0.28	0.51 ± 0.29	0.51 ± 0.28
8	FS-LASIK	−0.31 ± 0.09	0.55 ± 0.23	0.50 ± 0.23	0.48 ± 0.24	0.207	<0.001
	Trans-PRK	−0.33 ± 0.09	0.48 ± 0.26	0.45 ± 0.26	0.46 ± 0.26
9	FS-LASIK	−0.35 ± 0.10	0.41 ± 0.22	0.38 ± 0.21	0.36 ± 0.22	0.381	<0.001
	Trans-PRK	−0.37 ± 0.10	0.36 ± 0.24	0.35 ± 0.23	0.34 ± 0.24

FS-LASIK: femtosecond laser-assisted in situ keratomileusis; Trans-PRK: transepithelial photorefractive keratectomy; Dia: diameter.