From: Finite Element Modeling of Optic Nerve Head Biomechanics Invest. Ophthalmol. Vis. Sci.. 2004;45(12):4378-4387. doi:10.1167/iovs.04-0133 Figure Legend: Strain and stress distributions. Contour plots of magnitude of computed distributions of maximum principal strain (left) and von Mises equivalent stress (right) in the ONH region in models 1, 2, and 3, at an IOP of 50 mm Hg. The geometry is shown at true deformation scale. Because of the nature of the models, the strain and stress scale linearly with pressure, and thus the stress is displayed as multiples of IOP. Maximum principal strain represents the magnitude of maximum extension. Von Mises equivalent stress gives an indication of the forces acting throughout the tissue, while discounting the effects of hydrostatic pressure. Below each computed result are the average maximum principal strain (ε) and von Mises equivalent stress (σ) within the LC. Date of download: 10/31/2017 The Association for Research in Vision and Ophthalmology Copyright © 2017. All rights reserved.