Correlation of myopia onset and progression with corneal biomechanical parameters in children

Table 2 Comparison of corneal biomechanical parameters among the three groups of subjects

	Number of cases	A1V (ms-1)	A1L (mm)	A1T (ms)	A1DA (mm)	A2V (ms-1)	A2L (mm)	A2T (ms)	A2D (mm)	HCT (ms)	HCR (mm)	PD (mm)	DA (mm)	IR	ARTh	SP-A1	CBI	TBI
Myopia group	207	0.13 ± 0.02	1.85 ± 0.29	7.63 ± 0.29	0.12 ± 0.01	0.29 ± 0.06	1.73 ± 0.39	21.33 ± 0.93	0.37 ± 0.08	16.70 ± 0.79	7.59 ± 0.73	3.42 ± 0.88	0.98 ± 0.09	9.23 ± 1.93	472.03 ± 131.43	102.01 ± 18.43	0.53 ± 0.35	0.56 ± 0.25
Emmetropia group	102	0.15 ± 0.05	1.93 ± 0.33	7.41 ± 0.22	0.13 ± 0.01	0.30 ± 0.02	1.70 ± 0.55	21.57 ± 1.24	0.41 ± 0.09	16.73 ± 0.49	6.42 ± 0.89	3.77 ± 0.92	0.99 ± 0.09	9.05 ± 2.61	451.61 ± 111.43	107.32 ± 14.62	0.23 ± 0.14	0.33 ± 0.23
Hyperopia group	109	0.14 ± 0.03	1.77 ± 0.39	7.39 ± 0.29	0.13 ± 0.02	0.31 ± 0.05	1.63 ± 0.53	21.35 ± 1.29	0.47 ± 0.13	16.59 ± 0.66	6.69 ± 1.02	3.02 ± 0.61	0.99 ± 0.10	11.34 ± 1.34	256.45 ± 46.34	108.42 ± 14.45	0.02 ± 0.01	0.12 ± 0.07
F		13.57	6.258	36.89	29.34	5.780	1.610	1.706	37.52	1.267	78.85	21.67	0.6079	47.99	145.7	6.681	150.6	158.2
P value		< 0.0001	0.0021	< 0.0001	< 0.0001	0.0033	0.2011	0.1829	< 0.0001	0.2829	< 0.0001	< 0.0001	0.5450	< 0.0001	< 0.0001	0.0014	< 0.0001	< 0.0001

A1V: First velocity of applanation; A1L: First applanation length; A1T: First applanation time; A1DA: First applanation deformation amplitude; A2V: Second velocity of applanation; A2L: Second applanation length; A2T: Second applanation time; A2D: Second applanation deformation; HCT: Time from the start until the highest concavity; HCR: Central curvature radius at highest concavity; PD: Peak distance; DA: Deformation amplitude; IR: Integrated radius; ARTh: ambrosia relational thickness-horizontal; SP-A1: First applanation stiffness parameter; CBI: Corvis biomechanical index; TBI: Topographic and biomechanics index.