Table 6.
Correlation Between Visual Acuity and Keratometry Parameters of Patients at 6 months and 12 months post A-CXL
| Logmar UCVA | Logmar BCVA | Axis | Sphere | Cylinder | MRSE | |
|---|---|---|---|---|---|---|
| Correlation Coefficient (r), p-value | ||||||
| 6 Months | ||||||
| K1 | 0.134, 0.574 | 0.543, 0.002 | 0.348, 0.055 | −0.263, 0.160 | −0.062, 0.740 | −0.340, 0.066 |
| K2 | 0.190, 0.421 | 0.502, 0.006 | 0.418, 0.019 | −0.283, 0.130 | −0.036, 0.847 | −0.334, 0.071 |
| Kmean | 0.084, 0.726 | 0.477, 0.009 | 0.378, 0.036 | −0.278, 0.137 | −0.041, 0.828 | −0.333, 0.072 |
| Kmax | 0.067, 0.778 | 0.515, 0.004 | 0.435, 0.014 | −0.169, 0.372 | −0.100, 0.592 | −0.245, 0.191 |
| CCT Pupil Center | −0.320, 0.169 | −0.079, 0.683 | −0.070, 0.707 | 0.414, 0.023 | 0.125, 0.503 | 0.483, 0.007 |
| CCT Vertex Normal | −0.226, 0.338 | −0.198, 0.302 | −0.156, 0.403 | 0.386, 0.035 | 0.175, 0.347 | 0.484, 0.007 |
| Thinnest Location | −0.148, 0.535 | −0.192, 0.319 | −0.077, 0.682 | 0.261, 0.164 | 0.231, 0.211 | 0.412, 0.024 |
| 12 Months | ||||||
| K1 | 0.334, 0.129 | 0.525, 0.009 | −0.005, 0.979 | −0.504, 0.009 | −0.180, 0.378 | −0.554, 0.004 |
| K2 | 0.297, 0.180 | 0.495, 0.014 | −0.001, 0.996 | −0.384, 0.053 | −0.312, 0.121 | −0.513, 0.009 |
| Kmean | 0.301, 0.174 | 0.521, 0.009 | 0.006, 0.976 | −0.457, 0.019 | −0.239, 0.240 | −0.545, 0.005 |
| Kmax | 0.259, 0.244 | 0.553, 0.005 | 0.048, 0.815 | −0.276, 0.173 | −0.347, 0.082 | −0.382, 0.060 |
| CCT Pupil Center | −0.170, 0.449 | −0.168, 0.434 | −0.186, 0.363 | 0.513, 0.007 | −0.026, 0.901 | 0.525, 0.007 |
| CCT Vertex Normal | −0.171, 0.446 | −0.285, 0.177 | −0.074, 0.721 | 0.570, 0.002 | −0.007, 0.971 | 0.551, 0.004 |
| Thinnest Location | −0.129, 0.568 | −0.255, 0.230 | −0.036, 0.861 | 0.548, 0.004 | −0.088, 0.670 | 0.519, 0.008 |
Statistical Analysis Used: Spearman correlation; Correlation coefficient interpretation; 0–0.2, very weak; 0.2–0.4, weak; 0.4–0.6 moderate; 0.6–0.8, strong; 0.8–1.0, very strong; Shaded cells have p < 0.05. More darkly shaded cells have negative correlation coefficients; UCVA-Uncorrected Visual Acuity; BCVA-Best Corrected Visual Acuity K1-Flat Keratometry; K2-Steep Keratometry; Kmean-Mean Keratometry; Kmax-Maximal Keratometry; CCT-Central Corneal Thickness; DAR- Deformation Amplitude Ratio; IR- Integrated Radius; ARTh-Ambrósio relational thickness to the horizontal profile; SPA 1 Stiffness Parameter at first applanation; SSI- Stress Strain Index; BAD D-Belin/Ambrósio Enhanced Ectasia Total Deviation Display