人眼调节机制的仿真研究

目的:建立人眼晶状体的功能仿真模型,研究人眼的调节机制。方法:利用临床获得的数据,在计算机上建立晶状体调节的数字仿真模型,根据调节理论进行晶状体形变和调节仿真,并分析眼压对晶状体形变的影响。结果:仿真计算表明,随着调节的增加,前、后表面向远离晶状体中心的方向移动,晶状体厚度增大,前房深度减小;晶状体的前、后表面曲率半径增加,使得屈光力增大。晶状体形态对压力变化敏感:在晶状体表面施加压力后,前、后表面在压力的作用下向赤道部移动,晶状体厚度减小;前后表面曲率半径增大,赤道半径增大;屈光力随着压力的增大而增大。结论:仿真研究支持了 H elmholtz 的调节理论,与公认的调节事实相符合,表明了仿真研究是有效的研究方法。

A study on accommodation mechanism with numerical simulation

AIM: Accommodation is one of the most important functions of human eye, while its mechanism is still under discussion. This paper aimed to study accommodation mechanism with numerical simulation.METHODS: A simulation model was constructed to study the mechanism of accommodation based on the experimental data derived from published resources. The displacement and pressure are applied on the model to study the deformation of lens during accommodating.RESULTS: The simulation showed that, as the eye was accommodating, the thickness of the lens increased linearly,and the lens diameter decreased linearly. The optical power of the lens increased as the accommodation increased. This result was accord with the public facts in accommodation.Furthermore, the pressure was found to have a great influence on the shape of the lens and the optical power. The lens became thinner and flatter as the pressure increased and the pressure caused a remarkable increase of lens' optical power.CONCLUSION: The outcome of this paper is consistent with the Helmholtz's hypothesis on accommodation to some extent. The analytical model presented in this paper can be used in the theoretical study of the accommodation mechanism of the human lens.