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Table 3 Correlations between biomechanical parameters and corneal sublayer thickness in the KC group

From: Relationship between corneal biomechanical parameters and corneal sublayer thickness measured by Corvis ST and UHR-OCT in keratoconus and normal eyes

  

EPT

BLT

STT

SP-A1a

r

0.427

0.527

0.515

P

0.033d

0.007d

0.008d

SP-A1c

r

0.456

0.509

0.533

P

0.029d

0.013d

0.009d

A1Va

r

−0.355

−0.574

−0.495

P

0.082

0.003d

0.012d

A2Va

r

0.028

0.488

0.676

P

0.895

0.013d

0.000d

PDa

r

−0.102

−0.431

−0.351

P

0.627

0.031d

0.085

HCRa

r

0.447

0.276

0.150

P

0.025*

0.181

0.474

HCDfAa

r

−0.346

−0.495

−0.355

P

0.090

0.012d

0.081

IRb

r

−0.483

−0.495

−0.362

P

0.015d

0.012d

0.075

ARTha

r

0.292

0.130

0.560

P

0.157

0.537

0.004d

DA ratioa

r

−0.544

−0.390

−0.484

P

0.005d

0.054

0.014d

CBIb

r

−0.145

0.005

−0.325

P

0.488

0.981

0.112

TBI

r

–

–

–

P

–

–

–

  1. EPT = epithelial thickness; BLT = Bowman’s layer thickness; STT = stromal thickness; SP-A1 = stiffness parameter at first applanation; A1V = corneal apex velocity at first applanation; A2V = corneal apex velocity at second applanation; PD = peak distance; HCR = highest concavity radius of curvature; HCDfA = deflection amplitude at highest concavity; IR = integrated radius; ARTh = Ambrosio relational thickness to the horizontal profile; DA = deformation amplitude; CBI = Corvis biomechanical index; TBI = tomographic and biomechanical index; aPearson correlation test; bSpearman correlation test; cPartial correlation analysis controlling for the thickness of the other two layers; dP < 0.05