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Table 2 Distribution of normative values of Corvis ST parameters

From: Effect of biomechanical properties on myopia: a study of new corneal biomechanical parameters

Parameters

Mean ± SD

95% CI

A1-time (ms)

7.208 ± 0.289

7.194,7.223

A2-time (ms)

21.968 ± 0.373

21.949,21.987

HC-time (ms)

17.032 ± 0.401

17.011,17.052

A1DefA (mm)

0.097 ± 0.006

0.096,0.097

A2DefA (mm)

0.109 ± 0.011

0.108,0.109

HCDefA (mm)

0.941 ± 0.096

0.936,0.946

HCDefArea (mm2)

3.521 ± 0.501

3.495,3.547

DefAmax (mm)

0.953 ± 0.095

0.948,0.957

DAmax (mm)

4.349 ± 0.424

4.328,4.372

PD (mm)

5.181 ± 0.251

5.169,5.194

WEM (mm)

0.201 ± 0.065

0.258,0.265

SP-A1

107.866 ± 14.927

107.091,108.640

ARTh

581.715 ± 112.10

575.918,587.512

IR

7.902 ± 0.977

7.852,7.951

CBI

0.221 ± 0.187

0.212,0.230

SSI

0.854 ± 0.133

0.847,0.860

CCT (μm)

554 ± 32.75

576,587

bIOP (mmHg)

16 ± 2.06

15.9,16.1

  1. Values are presented as means (standard deviations) with 95% confidence intervals
  2. Corvis ST Corneal visualisation Scheimpflug technology, SD Standard deviation, CI Confidence interval, A1-and A2-times Time reaching the first and second applanation, HC-time Highest concavity-time, A1 and A2DefA Displacement of corneal apex at the first or second applanation or at the moment of highest concavity after whole eye motion is removed, HCDefA Amplitude at the highest concavity, HCDefArea Deflection area at the highest concavity, DefAmax Maximum deflection amplitude, DAmax Maximum deformation amplitude, PD Peak distance, WEM Whole eye movement, SP-A1 Stiffness parameter, IR Integrated radius, ARTh Ambrosio relational thickness horizontal, CBI Corvis biomechanical index, SSI Stress-strain index, CCT Central corneal thickness, bIOP Biomechanically corrected intraocular pressure
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BMC Ophthalmology

ISSN: 1471-2415

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