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. 2014 Aug 14;9(8):e104904. doi: 10.1371/journal.pone.0104904

Table 3. Corneal biomechanical parameters obtained from finite element analysis: Elasticity modulus represents the static material properties; The difference between anterior and posterior cornea describes the differences in collagen interweaving and the resulting higher anterior corneal rigidity; The relaxation time – which must lie within the temporal scale that was analyzed – describes the point of time at which the corneal stiffness decreased by the factor of the relative modulus; The muscle spring and damping constants describe the static and dynamic displacement, respectively, due to whole the eye movement in in vivo measurements.

Human Porcine
Condition virgin cross-linked
Elasticity modulus (Mpa)posterior cornea 0.40 0.85
Difference between anterior and posterior 1.12 30
Relaxation time (ms) 10 1.5
Relative modulus 0.3 0.7
Muscle spring constant (Nm) 350 -
Muscle damping constant (kg/s) 100 -

The latter two parameters represent accumulated contributions of muscles and fatty tissue and were not further interpreted.