Survival analysis of myopic regression after small incision lenticule extraction and femtosecond laser-assisted laser in situ keratomileusis for low to moderate myopia

Table 1 Baseline demographic and preoperative characteristics of study eyes in FS-LASIK and SMILE for (− 1.00 to − 6.00 D) myopia

Variable	FS-LASIK (n = 1414)	SMILE (n = 1629)	P value
Sex, n (%)			0.399
Male	576 (40.7)	638 (39.2)
Female	838 (59.3)	991 (60.8)
Mean age (years)	27.49 ± 6.78	28.38 ± 6.91	0.000
With contact lenes, n (%)	861 (60.9)	946 (58.1)	0.114
Pre-UCVA	0.14 ± 0.10	0.13 ± 0.10	0.016
Pre-CDVA	1.00 ± 0.06	1.00 ± 0.05	0.227
Flap/cap thickness (μm)	107.69 ± 4.65	120.14 ± 5.03	0.000
Mean manifest refraction
Sphere (D)	− 4.17 ± 1.24	− 4.19 ± 1.17	0.710
Cylinder (D)	− 0.72 ± 0.70	− 0.76 ± 0.67	0.124
Axis (^o)	76.26 ± 71.88	73.62 ± 72.30	0.315
SE (D)	− 4.67 ± 1.18	− 4.63 ± 1.17	0.694
Pre-IOP (mmHg)	15.49 ± 2.60	15.55 ± 2.61	0.517
Cornea diameter (mm)	11.31 ± 0.44	11.59 ± 0.39	0.000
Pre-CCT (μm)	536.32 ± 30.93	537.27 ± 28.87	0.380
Pre-HOARMS3	0.26 ± 0.12	0.25 ± 0.13	0.005
ACD (mm)	3.22 ± 0.27	3.16 ± 0.27	0.000
Depth of ablation (μm)	72.40 ± 18.65	96.48 ± 17.84	0.000
Optical zone (mm)	6.38 ± 0.25	6.49 ± 0.09	0.000

SMILE = small incision lenticule extraction group; FS-LASIK = femtosecond laser-assisted laser in situ keratomileusis group; pre-UCVA = preoperative uncorrected distance visual acuity; pre-CDVA = preoperative corrected distance visual acuity; pre-IOP = preoperative intraocular pressure; pre-CCT = preoperative central corneal thickness; pre-HOARMS3 = preoperative high-order aberration of root mean square for 3 mm pupil size; ACD = anterior chamber depth; Data are presented as mean ± SD

ISSN: 2326-0254