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

From: Survival analysis of myopic regression after small incision lenticule extraction and femtosecond laser-assisted laser in situ keratomileusis for low to moderate 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
  1. 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