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

Table 1

Preoperative characteristics by group.

Parameters	FS-LASIK (n = 44)	Trans-PRK (n = 32)	value
Age (years)	25.32 ± 6.00	26.60 ± 6.96	0.40
UDVA (logMAR)	1.04 ± 0.28	1.03 ± 0.32	0.79
CDVA (logMAR)	0.01 ± 0.02	0.00 ± 0.03	0.09
Sphere (D)	−3.92 ± 0.95	−3.89 ± 1.05	0.87
Cylinder (D)	−0.75 ± 0.41	−0.71 ± 0.36	0.62
SE (D)	−4.27 ± 1.02	−4.06 ± 1.09	0.34
CCT (μm)	540.49 ± 29.60	532.83 ± 30.28	0.13
K1 (D)	42.98 ± 1.32	42.89 ± 1.09	0.64
K2 (D)	44.05 ± 1.34	43.93 ± 1.20	0.56

FS-LASIK: femtosecond laser-assisted in situ keratomileusis; Trans-PRK: transepithelial photorefractive keratectomy; CDVA: corrected distance visual acuity (with spectacles); UDVA: uncorrected distance visual acuity; SE: spherical equivalent; D: diopters, CCT: central corneal thickness; K1: cornea flat meridian curvature; K2: cornea steep meridian curvature.