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Table 2 All the parameters acquired by the Corvis ST

From: Corneal biomechanical properties in myopic eyes evaluated via Scheimpflug imaging

Parameters Low myopia
(n = 49)
Moderate myopia
(n = 61)
High myopia
(n = 91)
Severe myopia (n = 64) P-value
A1-time (m/s) 7.07 ± 0.21 7.07 ± 0.18 7.12 ± 0.24 7.14 ± 0.26 0.212
A1-length (mm) 1.76 ± 0.16 1.73 ± 0.12 1.73 ± 0.08 1.72 ± 0.09 0.293
A1-velocity (m/s) 0.15 ± 0.01 0.15 ± 0.01 0.15 ± 0.01 0.15 ± 0.01 0.602
A2-time (m/s) 21.93 ± 0.45 21.79 ± 0.36 21.76 ± 0.43 21.66 ± 0.42 0.011
A2-length (mm) 1.72 ± 0.28 1.71 ± 0.30 1.60 ± 0.25 1.55 ± 0.28 0.001
A2-velocity (m/s) −0.38 ± 0.08 −0.40 ± 0.07 − 0.42 ± 0.07 − 0.46 ± 0.08 < 0.001
HC-time (m/s) 16.89 ± 0.38 16.69 ± 0.35 16.72 ± 0.32 16.59 ± 0.30 < 0.001
PD (mm) 4.16 ± 0.79 4.35 ± 0.66 4.23 ± 0.72 4.24 ± 0.79 0.619
HC radius (mm) 6.51 ± 0.79 6.63 ± 0.69 7.02 ± 0.86 6.52 ± 1.02 < 0.001
DA (mm) 1.14 ± 0.11 1.12 ± 0.09 1.13 ± 0.10 1.18 ± 0.12 0.007
  1. A1-time and A2-time: time from start until the first and second applanation; A1-length and A2-length: length of flattened cornea at the first and second applanation; A1-velocity and A2-velocity: corneal velocity during the first and second applanation; HC-time: time from start until highest concavity is arrived; PD: distance between the two peaks of the cornea at highest concavity; HC radius: central curvature at highest concavity; DA: maximum deformation amplitude at highest concavity. One-way analysis of variance (ANOVA) and LSD-t test was used to analyze the differences of corneal biomechanical parameters between the four groups. P < 0.05 was considered statistically significant