Table 1.

Demographics and preoperative variables of the study groups

	LASIK (n = 304)	LASIK WFG (n = 106)	PRK (n = 44)	PRK WFG (n = 30)	P value
Age, years
Myopes	34.04 ± 8.97	35.54 ± 8.64	35.12 ± 8.80	36.42 ± 6.71	0.81
Hyperopes	46.35 ± 8.57	48.71 ± 10.19	49.5 ± 6.5	44.91 ± 10.85	0.56
Spherical equivalent refraction, D
Myopes	–4.84 ± 2.07	–4.94 ± 2.22	–4.14 ± 1.60	–4.18 ± 1.95	0.48
Hyperopes	2.22 ± 1.34	1.74 ± 1.88	1.88 ± 0.25	1.86 ± 1.63	0.36
CCT, µm
Myopes	551.73 ± 31.85	553.92 ± 23.42	549.12 ± 30.49	546.95 ± 29.49	0.55
Hyperopes	559.17 ± 34.81	554.16 ± 44.97	525 ± 20	527.36 ± 52.97	0.67
Average keratometry, D
Myopes	43.79 ± 1.49	43.54 ± 1.28	43.55 ± 1.45	42.99 ± 3.03	0.96
Hyperopes	43.05 ± 1.59	42.85 ± 1.23	42.9 ± 3.3	44.23 ± 2.06	0.64
Spherical aberration, µm
Myopes	0.20 ± 0.09	0.17 ± 0.07	0.20 ± 0.19	0.29 ± 0.32	0.48
Hyperopes	0.21 ± 0.18	0.20 ± 0.15	0.21 ± 0.33	0.17 ± 0.17	0.65
Corneal HOA, µm
Myopes	0.38 ± 0.12	0.35 ± 0.10	0.36 ± 0.27	0.34 ± 0.40	0.36
Hyperopes	0.38 ± 0.24	0.35 ± 0.16	0.33 ± 0.41	0.35 ± 0.47	0.94

LASIK laser-assisted in situ keratomileusis, PRK photorefractive keratectomy, WFG wavefront-guided, CCT central corneal thickness, HOA higher-order aberration