Fig. 13.

FEA of adduction 6 deg past the point of ON straightening, assuming mechanically distinguishable rather than composite ON pia and neural tissue. (a) Modified ON model with soft neural tissue surrounded by separable pia. Neural tissues enclosed by 0.06-mm thick pia are rendered as green. Stress (b) and strain (c) distributions are qualitatively similar to those in Figs. 7(c) and 7(d) that assumed ON and pia to be composite, except for greater strain in the temporal ONH in the mechanically distinguishable model due to the low elastic modulus of neural tissue when assumed to lack internal connective tissue support.