The eye’s accommodative mechanism changes optical power for near vision. In accommodation, ciliary muscle excursion relieves lens tension, allowing it to return to its more convex shape. Lens deformation alters its refractive properties, but the mechanics of ciliary muscle actions are difficult to intuit due to the complex architecture of the tissues involved. The muscle itself comprises three sections of dissimilarly oriented cells. These cells contract, transmitting forces through the zonule fibers and extralenticular structures. This study aims to create a finite element model (FEM) to predict how the action of the ciliary muscle sections leads to lens displacement. The FEM incorporates initialization of the disaccommodated lens state and ciliary muscle contraction, with three muscle sections capable of independent activation, to drive accommodative movement. Model inputs were calibrated to replicate experimentally measured disaccommodated lens and accommodated ciliary muscle shape changes. Additional imaging studies were used to validate model predictions of accommodative lens deformation. Models were analyzed to quantify mechanical actions of ciliary muscle sections in lens deformation and position modulation. Analyses revealed that ciliary muscle sections act synergistically: the circular section contributes most to increasing lens thickness, while longitudinal and radial sections can oppose this action. Conversely, longitudinal and radial sections act to translate the lens anteriorly with opposition from the circular section. This FEM demonstrates the complex interplay of the three sections of ciliary muscle in deforming and translating the lens during accommodation, providing a useful framework for future investigations of accommodative dysfunction that occurs with age in presbyopia.

眼睛的调节机制改变近视力的光焦度。在调节过程中，睫状肌偏移可缓解晶状体张力，使其恢复到更凸出的形状。晶状体变形会改变其屈光特性，但由于所涉及组织的复杂结构，睫状肌动作的机制很难直观。肌肉本身包括三部分不同方向的细胞。这些细胞收缩，通过小带纤维和晶状体外结构传递力。本研究旨在创建一个有限元模型 (FEM) 来预测睫状肌部分的动作如何导致晶状体位移。FEM 结合了无调节晶状体状态和睫状肌收缩的初始化，具有能够独立激活的三个肌肉部分，推动宽松运动。模型输入被校准以复制实验测量的不适应晶状体和适应睫状肌形状的变化。额外的成像研究用于验证可调节晶状体变形的模型预测。分析模型以量化睫状肌切片在晶状体变形和位置调制中的机械作用。分析表明，睫状肌部分具有协同作用：圆形部分对增加晶状体厚度的贡献最大，而纵向和径向部分可以对抗这种作用。相反，纵向和径向部分用于在与圆形部分相反的情况下向前平移晶状体。