Fig 1.
Corneal movements after an air puff from CST and obtained parameters.
Pachy: central corneal thickness; A1/A2 Time: the durations of time taken from initiation of the air puff to first (when the cornea is moving inward) or second applanation (when the cornea moves outward); A1/A2 Length: the lengths of the flattened cornea at first and second applanations; A1/A2 Velocity: the corneal velocities during first and second applanations; HC Time: the length of time from the initiation of the deformation to the point when the cornea reaches highest concavity; Radius: the central curvature radius at the highest concavity; Peak Distance: the distance between the two surrounding peaks of the cornea at the highest concavity; A1 Def. Amp: the moving distance of the corneal apex from the initial position to that at the A1 Time; A2 Def. Amp: the moving distance of the corneal apex from the initial position to that at A2 Time; Def. Amp. Max: the distance of the corneal apex movement from the initiation of the deformation to the highest concavity.
Fig 2.
Changes in values of IOP-G, CT-90A and CST parameters following cataract surgery.
*: indicates a significant difference according to the Tukey-Kramer test. Values are expressed as mean plus error.
Table 1.
Parameters selected in the optimal models to explan each CST parameter.
Table 2.
Comparisons of the change in parameters between the corneal incision and sclera-corneal incision groups.
Fig 3.
Depiction of the viscoelastic system containing an elastic spring and a viscous damper.
The elastic hysteresis phenomenon is observed when cylcic loading is applied to a viscoelastic system. The loading and unloading deformation curves are called a hysteresis loop.
Fig 4.
A change in the hysteresis loop may explain biomechanical changes to the eye after cataract surgery.