Liu Zhuo, Wang Boliang, Xu Xiuying, Wang Cheng
College of Electronic Science and Engineering, National University of Defense Technology, 410073 Changsha, PR China.
Comput Med Imaging Graph. 2006 Sep-Oct;30(6-7):371-6. doi: 10.1016/j.compmedimag.2006.09.008. Epub 2006 Nov 13.
This paper constructs two finite element models of human crystalline lens and zonules based on published clinical data. Displacement and pressure were applied to study the mechanism of vision accommodation. The simulation results show that, in Model A, under the pull of the zonules, the thickness of the lens decreased linearly, and the lens diameter increased linearly. The optical power of the lens increased as the zonules displacement increased. Furthermore, the pressure had a remarkable influence on the shape of the lens and the optical power. The lens also became thinner and flatter as the pressure increased. The optical power increased when the pressure increased. In Model B, the lens became thicker and optical power increased as the equatorial zonules stretched. It is basically consistent with Schachar's hypothesis. The outcome of this paper proved that the analytical model presented in this paper can be used in the theoretical study of the accommodation mechanism of the lens.
本文基于已发表的临床数据构建了两个人体晶状体和悬韧带的有限元模型。施加位移和压力以研究视觉调节机制。模拟结果表明，在模型A中，在悬韧带的牵拉下，晶状体厚度呈线性减小，晶状体直径呈线性增加。晶状体的屈光力随着悬韧带位移的增加而增加。此外，压力对晶状体形状和屈光力有显著影响。随着压力增加，晶状体也变得更薄更扁平。压力增加时屈光力增加。在模型B中，随着赤道部悬韧带伸展，晶状体变厚且屈光力增加。这与沙查尔假说基本一致。本文的研究结果证明，本文提出的分析模型可用于晶状体调节机制的理论研究。
