Table 2. Matching results of the cases considered in the validation study.
| x0, μm | y0, μm | z0, μm | α, degree | β, degree | γ, degree | ||
|---|---|---|---|---|---|---|---|
| Case 1 | Pre-set | 0.759 | 1.048 | -0.445 | -0.013 | 0.005 | 0.042 |
| Computed | 0.758 | 1.045 | -0.445 | -0.013 | 0.005 | 0.041 | |
| Diff Ratio | -0.17% | -0.25% | -0.02% | -0.11% | -0.30% | -1.02% | |
| Case 2 | Pre-set | 97.078 | 1.048 | -0.445 | -0.013 | 0.005 | 0.042 |
| Computed | 97.074 | 1.020 | -0.445 | -0.012 | 0.005 | 0.040 | |
| Diff Ratio | -0.01% | -2.67% | -0.05% | -1.57% | -0.70% | -3.37% | |
| Case 3 | Pre-set | 0.759 | 106.723 | -0.445 | -0.013 | 0.005 | 0.042 |
| Computed | 0.726 | 106.710 | -0.445 | -0.013 | 0.005 | 0.043 | |
| Diff Ratio | -4.35% | -0.01% | -0.07% | -0.76% | -4.34% | 2.44% | |
| Case 4 | Pre-set | 0.759 | 1.048 | 1.383 | -0.013 | 0.005 | 0.042 |
| Computed | 0.758 | 1.045 | 1.383 | -0.013 | 0.005 | 0.041 | |
| Diff Ratio | -0.17% | -0.25% | 0.01% | -0.11% | -0.30% | -1.02% | |
| Case 5 | Pre-set | 0.759 | 1.048 | -0.445 | 0.781 | 0.005 | 0.042 |
| Computed | 0.755 | 1.042 | -0.446 | 0.781 | 0.005 | 0.041 | |
| Diff Ratio | -0.62% | -0.55% | 0.02% | 0.01% | -0.76% | -0.75% | |
| Case 6 | Pre-set | 0.759 | 1.048 | -0.445 | -0.013 | 0.731 | 0.042 |
| Computed | 0.751 | 1.046 | -0.445 | -0.013 | 0.731 | 0.041 | |
| Diff Ratio | -1.05% | -0.21% | -0.04% | -0.13% | -0.01% | -0.50% | |
| Case 7 | Pre-set | 0.759 | 1.048 | -0.445 | -0.013 | 0.005 | 4.655 |
| Computed | 0.764 | 1.045 | -0.445 | -0.013 | 0.005 | 4.655 | |
| Diff Ratio | 0.66% | -0.24% | -0.04% | -0.09% | 0.53% | -0.01% | |
| Case 8 | Pre-set | 97.078 | 106.723 | -0.445 | -0.013 | 0.005 | 0.042 |
| Computed | 97.075 | 106.703 | -0.445 | -0.013 | 0.005 | 0.041 | |
| Diff Ratio | -0.003% | -0.02% | -0.04% | -1.13% | -0.88% | -2.51% | |
| Case 9 | Pre-set | 0.759 | 1.048 | -0.445 | 0.781 | 0.731 | 0.042 |
| Computed | 0.750 | 1.056 | -0.445 | 0.781 | 0.731 | 0.042 | |
| Diff Ratio | -1.28% | 0.79% | 0.003% | -0.01% | -0.01% | 0.15% | |
| Case 10 | Pre-set | 97.078 | 1.048 | 1.383 | 0.781 | 0.005 | 4.655 |
| Computed | 97.079 | 1.038 | 1.387 | 0.781 | 0.005 | 4.654 | |
| Diff Ratio | 0.002% | -0.98% | 0.29% | 0.0% | -0.10% | -0.01% | |
| Case 11 | Pre-set | 97.078 | 106.723 | 1.383 | 0.781 | 0.731 | 4.655 |
| Computed | 97.086 | 106.699 | 1.383 | 0.781 | 0.731 | 4.655 | |
| Diff Ratio | 0.01% | -0.02% | 0.002% | 0.02% | 0.01% | -0.002% |
x0, y0, z0 represent the translational displacements of corneal surface; α, β, γ represent the angular rotations about the three main axes (x, y and z); Pre-set means the artificial misalignments added to the corneal elevation data pre topography matching; Computed means the misalignments calculated using the ICP algorithm; Diff Ratio in percentages means the ratio of the difference compared with Pre-set misalignments