Figure 1.

A, Simulation setup with the eye model (left) and soccer ball (cut view; right). B, Eye model showing boundary condition points highlighted in red (left). These boundary condition points represent the insertion points of the extraocular rectus muscles and the optic nerve head. The numerical labels correspond with the structures as follows: 1, superior rectus muscle; 2, medial or lateral rectus muscle; 3, inferior rectus muscle; and 4, optic nerve head. The medial or lateral rectus muscle on the opposite side of the eye was also simulated, but is not pictured. A reference diagram is provided below. (Adapted from Patrick J. Lynch, medical illustrator; C. Carl Jaffe, MD, cardiologist, CC BY 2.5).