Table 1.
Findings of studies comparing ultrasound pachymetry with Orbscan II in determinations of central corneal thickness.
| Investigator | Study Population | N Eyes | US±SD µm | Orbscan±SD µm | US-Orbscan µm |
|---|---|---|---|---|---|
| Doughty9 | Normals | 50 | 523±37 | 544±40 | −21 |
| Fernandez10 | Normals | 92 | 551.2±43.8 | 559.9±35.8 | −9 |
| Gherghel11 | Normals | 137 | 550.5±37.2 | 546.4±48.1 | 4 |
| Gonzalez-Meijome12 | Normals | 24 | 545±40 | 515±45 | 30 |
| Iskander13 | Normals* | 906 | 532.6±30.0 | 514.2±33.0 | 18 |
| Kawana14 | Normals | 203 | 478.8±41.9 | 445.6±60.0 | 33 |
| Lackner15 | Normals | 30 | 552.0±31.7 | 530.0±33.9 | 22 |
| McLaren16 | Normal | 24 | 554±28 | 540±35 | 14 |
| Rainer4 | Normal | 40 | 543.4±34.8 | 523.6±36.2 | 20 |
| Suzuki30 | Normal | 216 | 548.1±33.0 | 546.9±35.4 | 1 |
| Radford17 | Glaucoma | 66 | 558.4±34.6 | 564.9±36.5 | 7 |
| Iskander13 | Post-LASIK | 183 | 482.8±40.0 | 432.7±44.0 | 50 |
| Kawana14 | Post-LASIK | 203 | 478.8±41.9 | 445.6±60.0 | 33 |
| Ho18 | Post-LASIK | 103 | 438.2±41.2 | 435.2±49.6** | 3** |
| Gherghel11 | Keratoconus | 64 | 502.8±52.5 | 458.8±62.5 | 44 |
| Kawana19 | Keratoconus | 22 | 485.0±29.3 | 449.5±43.2 | 35 |
*
Pre-LASIK
**
Acoustic correction factor = 0.89