Association between Corneal Stiffness Parameter at the First Applanation and Keratoconus Severity
Table 2
Association between SP-A1 and Corvis ST parameters.
Parameters
Normal
Mild
Moderate
Severe
r
r
r
r
IOP
0.695
<0.001
0.659
<0.001
0.831
<0.001
0.807
<0.001
bIOP
0.397
<0.001
0.471
<0.001
0.704
<0.001
0.709
<0.001
DA
−0.631
<0.001
−0.654
<0.001
−0.719
<0.001
−0.678
<0.001
PD
−0.592
<0.001
−0.550
<0.001
−0.416
<0.001
−0.399
0.003
Radius
0.168
0.002
0.260
0.001
0.391
<0.001
0.264
0.056
A1T
0.546
<0.001
0.575
<0.001
−0.765
<0.001
0.744
<0.001
A1V
−0.746
<0.001
−0.655
<0.001
−0.530
<0.001
−0.545
<0.001
A1DLL
−0.107
0.045
−0.286
<0.001
−0.101
0.233
−0.059
0.683
A2T
−0.584
<0.001
−0.550
<0.001
−0.638
<0.001
−0.494
<0.001
A2V
0.542
<0.001
0.528
<0.001
0.523
<0.001
0.549
<0.001
A2DLL
−0.044
0.418
−0.151
0.062
−0.252
0.003
−0.137
0.347
HCT
0.021
0.701
0.001
0.989
0.055
0.518
0.223
0.108
HCDLL
−0.358
<0.001
−0.306
<0.001
−0.104
0.223
−0.084
0.564
DA Ratio Max [1 mm]
−0.474
<0.001
−0.376
<0.001
−0.509
<0.001
−0.199
0.152
DA Ratio Max [2 mm]
−0.620
<0.001
−0.594
<0.001
−0.681
<0.001
−0.463
<0.001
IOP, intraocular pressure; bIOP, biomechanical corrected intraocular pressure; DA, deformation amplitude; PD, peak distance; A1T, time from the initiation of air puff until the first applanation; A1V, corneal velocity at the first applanation; A1DLL, deflection length at the first applanation; A2T, time from the initiation of air puff until the second applanation; A2V, corneal velocity at the second applanation; A2DLL, deflection length at the second applanation; HCT, time from the initiation of air puff until the maximum deformation; HCDLL, deflection length at the maximum deformation.
