Table 2.
The meaning of Corvis ST parameters.
| Parameter | Explanation |
|---|---|
| First applanation time (AT1) | Time to reach first applanation |
| First applanation length (AL1) | Length of the deformed part of the cornea at first applanation |
| First applanation velocity (AV1) | Corneal velocity at first applanation |
| Second applanation time (AT2) | Time to reach second applanation |
| Second applanation length (AL2) | Length of the deformed part of the cornea at second applanation |
| Second applanation velocity (AV2) | Corneal velocity at second applanation |
| Highest concavity time (HCT) | Time to reach highest concavity |
| Deformation amplitude (DA) | Sagittal length of deformation of the apex at highest concavity |
| Peak distance (PD) | The distance of the part of the cornea without deformation at highest concavity |
| Radius of curvature (Rad) | Radius of curvature at highest concavity |
| Deformation amplitude ratio (DAR) | The ratio between the deformation amplitude at the apex and the deformation amplitude at 2 mm |
| Integrated radius (Integr Rad) | The integrated area under the inverse radius curve during the concave phase |
| Stiffness parameter at first applanation (SP-A1) | Pressure at first applanation–Biomechanically corrected intraocular pressure/deflection amplitude at first applanation |
| Ambrósio's relational thickness horizontal (ARTh) | The division between corneal thickness at the thinnest point and the progression index that describes the thickness increase from the thinnest point to the periphery |