Table 1. Comparison of visual and refractive outcomes between small-incision lenticular extraction and photorefractive keratectomy.
| SMILE | PRK | P-value | ||
|---|---|---|---|---|
| CDVA (logMAR) | Pre-Op | 0.001 ± 0.008 | −0.018 ± 0.029 | 0.008 |
| Month 1 | 0.027 ± 0.041 | 0.039 ± 0.091 | 0.581 | |
| Month 3 | 0.018 ± 0.029 | 0.011 ± 0.050 | 0.600 | |
| Month 6 | 0.021 ± 0.055 | 0.013 ± 0.049 | 0.594 | |
| UDVA (logMAR) | Month 1 | 0.051 ± 0.069 | 0.133 ± 0.129 | 0.009 |
| Month 3 | 0.061 ± 0.081 | 0.070 ± 0.085 | 0.732 | |
| Month 6 | 0.044 ± 0.058 | 0.060 ± 0.093 | 0.452 | |
| Efficacy Index | Month 1 | 0.903 ± 0.131 | 0.735 ± 0.200 | 0.002 |
| Month 3 | 0.886 ± 0.146 | 0.833 ± 0.171 | 0.313 | |
| Month 6 | 0.915 ± 0.115 | 0.858 ± 0.193 | 0.215 | |
| Safety Index | Month 1 | 0.947 ± 0.087 | 0.892 ± 0.164 | 0.188 |
| Month 3 | 0.965 ± 0.066 | 0.942 ± 0.122 | 0.463 | |
| Month 6 | 0.962 ± 0.099 | 0.940 ± 0.125 | 0.537 | |
| Spherical | Pre-Op | −7.37 ± 0.72 | −7.65 ± 0.99 | 0.326 |
| Equivalent (D) | Month 1 | 0.00 ± 0.28 | −0.43 ± 0.35 | 0.000 |
| Month 3 | −0.05 ± 0.29 | −0.27 ± 0.27 | 0.011 | |
| Month 6 | −0.12 ± 0.26 | −0.28 ± 0.28 | 0.044 | |
| Sphere (D) | Pre-Op | −6.77 ± 0.82 | −7.10 ± 1.01 | 0.277 |
| Month 1 | 0.07 ± 0.32 | −0.09 ± 0.19 | 0.029 | |
| Month 3 | 0.04 ± 0.29 | −0.03 ± 0.12 | 0.228 | |
| Month 6 | −0.01 ± 0.25 | −0.04 ± 0.18 | 0.680 | |
| Cylinder (D) | Pre-Op | −1.20 ± 0.58 | −1.10 ± 0.66 | 0.625 |
| Month 1 | −0.16 ± 0.23 | −0.70 ± 0.59 | 0.001 | |
| Month 3 | −0.19 ± 0.23 | −0.47 ± 0.53 | 0.037 | |
| Month 6 | −0.21 ± 0.21 | −0.48 ± 0.45 | 0.014 |
SMILE = small-incision lenticule extraction, PRK = photorefractive keratectomy, CDVA = corrected distance visual acuity, Pre-Op = preoperative, UDVA = uncorrected distance visual acuity.