Finite element model of ocular adduction with unconstrained globe translation

• DOI: 10.1007/s10237-023-01794-3
• Publication Date: 2024-02-28T17:02:29Z
• Authors: Somaye Jafari; Joseph Park; Yongtao Lu; Joseph L. Demer
• Keywords: Globe

Details of the anatomy and behavior structures responsible for human eye movements have been extensively elaborated since first modern biomechanical models were introduced. Based on these findings, a finite element model ocular adduction is developed based connective measured optic nerve (ON) properties, as well active contractility bilaminar extraocular muscles (EOMs), but incorporating novel feature that globe translation not otherwise constrained so realistic kinematics can be simulated. Anatomy hemisymmetric defined by magnetic resonance imaging. The modeled suspended anatomically tissues, orbital fat, contiguous ON. incorporates material subroutine implements EOM contraction fiber twitch characteristics. Starting from initial condition 26° adduction, medial rectus (MR) muscle was commanded to contract lateral (LR) relaxed. We alternatively absence or presence fat. During pursuit-like 26 32°, translated 0.52 mm posteriorly 0.1 medially with fat present, 1.2 without Maximum principal strains in disk peripapillary reached 0.05-0.06, von-Mises stress 96 kPa. Tension MR layer ~ 24 g-force after 6° only 3 gm-f whole LR. This physiologically plausible simulation activation an suspensory system demonstrates tissues are integral biomechanics including loading