Eye measurements before SMILE and FS-LASIK
| Parameters | SMILE (n=39) | FS-LASIK (n=34) | P value |
| Age (years) | 31.18±9.36 (21~56) | 35.95±12.48 (23~63) | 0.073 |
| Sphere (D) | −10.13±0.96 (–7.75~−13.00) | −10.32±1.14 (–8.25~−13.25) | 0.445 |
| Cylinder (D) | −1.30±1.00 (0~−4.50) | −1.56±0.86 (–0.25~−3.50) | 0.249 |
| SE (D) | −10.79±0.81 (–10.00~−13.00) | −11.06±0.99 (−10.00~−14.50) | 0.797 |
| UDVA | 0.03±0.03(0.01~0.10) | 0.02±0.03(0.01~0.10) | 0.468 |
| CDVA | 0.99±0.13 (0.60~1.20) | 0.96±0.15(0.06~1.20) | 0.301 |
| TCT (μm) | 545.3±23.4 (503~597) | 553.3±36.1 (498~620) | 0.244 |
| IOP (mm Hg) | 16.52±2.36 (12.2~22.0) | 15.68±3.30 (9.0~21.1) | 0.220 |
| Optical zone (mm) | 6.14±0.21 (5.75~6.50) | 5.97±0.20 (5.75~6.50) | 0.001 |
| Ablation depth (μm) | 151.54±6.59 (132.00~163.00) | 147.79±9.40 (124~160) | 0.057 |
| RBT (μm) | 278.90±17.29 (253.00~319.00) | 316.03±33.15 (267~376) | 0.000 |
CDVA, corrected distance visual acuity; D, dioptres; FS-LASIK, femtosecond laser-assisted in situ keratomileusis; IOP, intraocular pressure; RBT, residual bed thickness; SE, spherical equivalent; SMILE, small incision lenticule extraction; TCT, thinnest corneal thickness; UDVA, uncorrected distance visual acuity.