Table 2.
Mean ± standard deviation (SD) and range of central corneal thickness readings measured with ultrasonic pachymetry, Pentacam and Orbscan II before and after surgery, and the resulting mean change and 95% confidence interval (CI) of the calculated mean difference
| Preoperative | Six-month postoperative | Difference | ||||
|---|---|---|---|---|---|---|
| Device | Mean ± SD | Range | Mean ± SD | Range | Mean ± SD | 95% CI of difference |
| Ultrasound | 557±34 | 508 to 616 | 451±38 | 397 to 507 | 106±26 | 99 to 114 |
| Pentacam | 556±33 | 501 to 605 | 447±41 | 390 to 504 | 109±27 | 101 to 117 |
| Orbscan II | 564±38 | 504 to 613 | 438±51 | 330 to 525 | 125±30 | 117 to 134 |