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Central corneal thickness measured by three methods.
| Case | Eye | OCT (μm) | Ultrasound (μm) | Orbscan (μm) |
|---|---|---|---|---|
| 1 | OD | 540 | 532 | 336 |
| 1 | OS | 571 | 550 | 481 |
| 2 | OS | 461 | 454 | 401 |
| 3 | OD | 552 | 540 | 573 |
| 3 | OS | 556 | 573 | 569 |
| 4 | OD | 496 | 486 | 408 |
| 4 | OS | 493 | 408 | 445 |
| 5 | OS | 512 | d | 377 |
OCT = optical coherence tomography
The mean difference between methods—OCT versus US: 6.4 ± 11.7 μm (P = .17, t test); Orbscan versus US: -67.5 ± 72.5 μm (P = .026, t test)
