Table 2 Corneal deformation parameters provided by the Corvis ST

1st Applanation

The first applanation of the cornea during the air puff (in milliseconds). The length of the applanation at this moment appears in parenthesis (in millimeters).

Highest Concavity

The instant that the cornea assumes its maximum concavity during the air puff (in milliseconds). The length of the distance between the two peaks of the cornea at this moment appears in parenthesis (in millimeters).

2nd Applanation

The second applanation of the cornea during the air puff (in milliseconds). The length of the applanation at this moment appears in parenthesis (in millimeters).

Maximum Deformation

The amount (in millimeters) of the maximum cornea deformation during the air puff.

Wing Distance

The length of the distance between the two peaks of the cornea at this instant (in millimeters).

Maximum Velocity (in)

Maximum velocity during the ingoing phase (in meters per seconds [m/s]).

Maximum Velocity (out)

The maximum velocity during the outgoing phase (in meters per seconds [m/s]) .

Curvature Radius Normal

The cornea in its natural state radius of curvature (in millimeters).

Curvature Radius HC

The cornea radius of curvature at the time of maximum concavity during the air puff (in millimeters).

Cornea Thickness

Measurement of the corneal thickness (in millimeters).

Integrated Inverse Radius

Inverse of the radius of curvature during concave phase of the deformation.

Deformation Amplitude Ratio 1 or 2 mm

The central deformation divided by an average of the deformation 1 or 2 mm at either side of center with maximum value just prior to 1st applanation.

IOP

Measurement of the intraocular pressure (in millimeters of Mercury [mmHg]).

bIOP

Biomechanically-corrected IOP