Table 1. The characteristics of the objective visual quality of all eyes with the best correction.
| Variables | ALL (n=90) | Emmetropia (n=17) | Mild myopia (n=48) | Moderate myopia (n=25) | P a |
| BUT (s) | 5.00 (5.00, 6.00) | 5.00 (5.00, 5.00) | 5.00 (5.00, 6.00) | 5.00 (5.00, 6.00) | 0.3486 |
| OSI | 0.38 (0.25, 0.60) | 0.30 (0.25, 0.40) | 0.40 (0.25, 0.55) | 0.55 (0.30, 0.75) | 0.0603 |
| MTFcut-off | 44.66 (38.8, 50.01) | 43.04 (38.80, 49.09) | 44.66 (39.17, 49.22) | 45.07 (36.33, 51.21) | 0.9897 |
| SR | 0.24±0.05 (0.12-0.33) | 0.25±0.05 (0.15-0.31) | 0.25±0.05 (0.14-0.33) | 0.23±0.05 (0.12-0.33) | 0.3307 |
| OV100% | 1.50 (1.30, 1.65) | 1.45 (1.30, 1.65) | 1.48 (1.30, 1.65) | 1.50 (1.20, 1.70) | 0.9572 |
| OV20% | 1.10±0.25 (0.60-1.55) | 1.11±0.25 (0.65-1.50) | 1.11±0.25 (0.60-1.55) | 1.07±0.27 (0.60-1.45) | 0.8022 |
| OV9% | 0.67±0.17 (0.30-1.00) | 0.69±0.15 (0.40-0.90) | 0.68±0.17 (0.30-1.00) | 0.63±0.18 (0.30-0.90) | 0.5066 |
aThe mixed effect linear model was applied to compare the difference among the three groups: emmetropia (+0.50≥SE≥-0.25 D), mild myopia (-0.25>SE≥-3.00 D), and moderate myopia (-3.00>SE≥-6.00 D). BUT: Break-up time; OSI: Scattering index; MTFcut-off: Modulation transfer function cut-off; SR: Strehl ratio; OV100%: The predictive visual acuity at contrasts of 100%; OV20%: The predictive visual acuity at contrasts of 20%; OV9%: The predictive visual acuity at contrasts of 9%; SE: Spherical equivalent refraction. Normally distributed variables were described as mean±standard deviation (range), while skewed data was expressed as median (1st quartile, 3rd quartile).