Fig. 3.

Numerical parameters [${\mathit{\mu }}_1$ (a), ${\mathit{\gamma }}_1$ (b), ${\mathit{\beta }}_1$ (c), ${\mathit{\tau }}_1$ (d), ${\mathit{\beta }}_2$ (e) and ${\mathit{\tau }}_2$ (f)] derived for the constitutive model describing the anisotropic, viscoelastic and hyperelastic corneal behaviour from 50 to 95 years of age. The bar charts provide the discrete values derived for the best fit with each age group. Other numerical parameters are constant with age and are presented in Table 1