Corneal biomechanics in normal and subclinical keratoconus eyes

BMC Ophthalmology

Table 2 Corvis ST parameters in normal and subclinical keratoconus eyes

Mean estimates value	Normal (n = 69)	Subclinical Keratoconus (n = 73)	P-value
A1 length (mm)	2.30	2.25	0.331
A2 length (mm)	1.52	1.45	0.333
A1 velocity (m/s)	0.14	0.14	0.557
A2 velocity (m/s)	-0.33	-0.33	0.127
Peak Distance (mm)	5.02	4.95	0.024
Radius (mm)	7.46	7.33	0.406
Deform Amplitude (mm)	1.07	1.08	0.635
Deform Amplitude (DA) ratio	4.29	4.35	0.198
Integrated Radius (mm⁻¹)	7.70	7.79	0.564
ARTh	545.38	451.94	< 0.001
SPA1	96.84	95.98	0.467
CBI	0.43	0.61	< 0.001
TBI	0.23	0.55	< 0.001

ARTh Ambrósio relational thickness to the horizontal profile, SPA1 Stiffness parameter at the first applanation, CBI Corvis biomechanical index, TBI Tomographic and biomechanical index

ISSN: 1471-2415