Table 1. Characteristics of included studied.
| First author | Year | Location | Design | Follow-up (mo) | Intervention | Eyes (n) | Mean age (a) | Preoperative SE (D) | Quality |
| Li M[18] | 2013 | China | NR | 6 | SMILE | 38 | 28.21±7.04 | -6.68±1.34 | 20 |
| FS-LASIK | 33 | 27.33±6.58 | -7.96±2.61 | ||||||
| Demirok A[7] | 2013 | Turkey | R | 6 | SMILE | 28 | 26.2±4.4 | -3.9±1.5 | 26 |
| FS-LASIK | 28 | 26.2±4.4 | -4.0±1.4 | ||||||
| Xu Y[16] | 2014 | China | NR | 6 | SMILE | 81 | 24.1±6.03 | -5.7±1.71 | 20 |
| FS-LASIK | 97 | 23.96±5.14 | -5.8±2.01 | ||||||
| Denoyer A[15] | 2014 | France | NR | 6 | SMILE | 30 | 31.1±4.7 | -4.65±2.38 | 21 |
| FS-LASIK | 30 | 32.2±7.5 | -4.42±1.78 | ||||||
| Wang B[17] | 2015 | China | NR | 12 | SMILE | 47 | 25.21±6.51 | -7.46±1.11 | 20 |
| FS-LASIK | 43 | 24.72±6.53 | -7.44±1.13 | ||||||
| Xia L[19] | 2016 | China | NR | 6 | SMILE | 69 | 25.15±4.42 | -5.04±2.32 | 21 |
| FS-LASIK | 59 | 23.65±3.87 | -5.13±1.36 | ||||||
| Li M[21] | 2013 | China | NR | 6 | SMILE | 32 | 27.1±4.0 | -6.56±1.28 | 20 |
| FS-LASIK | 42 | 28.3±5.5 | -8.46±2.15 | ||||||
| Wei S[20] | 2013 | China | NR | 3 | SMILE | 61 | 27.44±6.52 | -5.11±1.25 | 20 |
| FS-LASIK | 54 | 25.44±7.15 | -5.50±1.54 |
SMILE: Small incision lenticule extraction; FS-LASIK: Femtosecond laser-assisted in situ keratomileusis; SE: Spherical equivalent; D: Diopter; NR: Non-randomize; Quality (reporting, external validity, bias, confounding, power).