Corneal Biomechanical Properties in Myopic Eyes Measured by a Dynamic Scheimpflug Analyzer
Table 2
All the parameters obtained by CorVis ST for the 4 groups, mean ± SD.
Parameters
Emmetropia ()
Low myopia ()
Moderate myopia ()
High myopia ()
value
A1-time (ms)
7.30 ± 0.23
7.37 ± 0.22
7.50 ± 0.28
7.42 ± 0.20
0.04
A2-time (ms)
21.88 ± 0.33
21.84 ± 0.37
21.68 ± 0.38
21.69 ± 0.39†
0.02
A1-length (mm)
1.76 ± 0.05
1.77 ± 0.03
1.76 ± 0.08
1.78 ± 0.04
0.68
A2-length (mm)
1.67 ± 0.34
1.75 ± 0.21
1.70 ± 0.24
1.74 ± 0.25
0.71
A1-velocity (m/s)
0.15 ± 0.01
0.14 ± 0.01
0.14 ± 0.02
0.15 ± 0.01
0.10
A2-velocity (m/s)
−0.32 ± 0.05
−0.31 ± 0.08
−0.30 ± 0.05
−0.33 ± 0.07
0.37
HC-time (ms)
17.18 ± 0.47
17.06 ± 0.57
17.07 ± 1.10
17.87 ± 0.49
0.46
PD (mm)
3.80 ± 1.17
3.78 ± 1.17
4.15 ± 1.13
3.69 ± 1.22
0.47
HC radius (mm)
7.09 ± 1.08
7.12 ± 0.91
7.32 ± 0.89
6.65 ± 0.66
0.03
DA (mm)
1.03 ± 0.08
1.01 ± 0.09
0.98 ± 0.09
1.05 ± 0.10
0.048
IOP (mmHg)
13.69 ± 2.04
13.93 ± 2.11
15.03 ± 2.67
14.33 ± 1.98
0.17
CCT (μm)
537.3 ± 34.6
546.4 ± 30.0
541.7 ± 21.7
533.6 ± 32.2
0.49
A1- and A2-time: time reaching the first and second applanation; A1- and A2-length: length of the first and second applanation; A1- and A2-velocity: velocity at the first- and second-applanation moment; HC-time: highest concavity- (HC-) time; PD: peak distance; HC radius: radius at HC; DA: deformation amplitude; IOP: intraocular pressure; CCT: central corneal thickness. versus Moderate myopia group. versus Emmetropia group. versus Emmetropia group.
