Effect of corneal radius of curvature on SPAC measurement
| Scanning distance (mm) | Corneal radius of curvature (mm) | Maximum difference | |||||
|---|---|---|---|---|---|---|---|
| 7.0 | 7.4 | 7.8 | 8.2 | 8.6 | mm | % | |
| NA = not available. | |||||||
| 0.000 | 2.659 | 2.618 | 2.580 | 2.550 | 2.514 | 0.146 | 5.480 |
| 0.400 | 2.528 | 2.488 | 2.451 | 2.421 | 2.386 | 0.142 | 5.624 |
| 0.800 | 2.398 | 2.360 | 2.324 | 2.294 | 2.261 | 0.138 | 5.742 |
| 1.200 | 2.270 | 2.233 | 2.199 | 2.170 | 2.137 | 0.133 | 5.868 |
| 1.600 | 2.143 | 2.107 | 2.074 | 2.045 | 2.013 | 0.129 | 6.040 |
| 2.000 | 2.015 | 1.980 | 1.948 | 1.919 | 1.888 | 0.127 | 6.300 |
| 2.400 | 1.884 | 1.850 | 1.818 | 1.788 | 1.757 | 0.126 | 6.704 |
| 2.800 | 1.746 | 1.713 | 1.680 | 1.649 | 1.618 | 0.128 | 7.323 |
| 3.200 | 1.599 | 1.565 | 1.532 | 1.499 | 1.467 | 0.132 | 8.263 |
| 3.600 | 1.438 | 1.403 | 1.368 | 1.332 | 1.298 | 0.140 | 9.703 |
| 4.000 | 1.256 | 1.219 | 1.182 | 1.142 | 1.106 | 0.150 | 11.930 |
| 4.400 | 1.046 | 1.008 | 0.968 | 0.923 | 0.885 | 0.161 | 15.409 |
| 4.800 | 0.805 | 0.766 | 0.725 | 0.676 | 0.638 | 0.167 | 20.733 |
| 5.200 | 0.539 | 0.504 | 0.466 | 0.420 | NA | 0.120 | 22.206 |
| 5.600 | 0.287 | 0.261 | 0.231 | 0.193 | NA | 0.094 | 32.811 |
| 6.000 | 0.089 | 0.073 | 0.052 | 0.022 | NA | 0.067 | 75.294 |