1.Key Laboratory of Nondestructive Test,Ministry of Education,Nanchang Hangkong University,Nanchang,330063;2.China
目的 研究声激励下激励源、眼内压以及材料参数对人眼频率响应的影响。方法 基于三维有限元全眼模型，根据人眼形变及应力分布结果云图等，定量分析了各参数对人眼频率响应的影响。结果 其它参数保持不变，只改变激励源的位置、大小时，声激励源分别放在角膜正上方、偏45°处以及激励较大时，134Hz时的人眼共振幅值分别为35μm、48μm和133μm；只改变眼内压时，第一阶共振频率几乎不受眼内压的影响，其它阶的共振频率随眼内压增大稍向左偏移；只改变巩膜弹性参数时，人眼组织的共振频率随着巩膜弹性的增大而增大。结论 激励源的位置和大小对人眼的共振频率无影响，但对共振幅值有较大影响。眼组织材料参数对人眼的频率响应影响较大。眼内压对共振频率影响近似线性，为临床开发高性能的眼内压监测技术提供了理论基础。
Objective: To study the effects of excitation source, intraocular pressure, and material parameters on the frequency response of the human eye under acoustic excitation. Method: Based on the three-dimensional model of the whole eye, the finite element analysis was performed. According to the deformation and stress distribution of the human eye, the amplitude value at resonance, the effects of various parameters on frequency response of the human eye were quantitatively analyzed. Results: When the intraocular pressure and material parameters are constant and the position and size of the excitation source are changed, the acoustic excitation source is placed directly above the cornea, and an offset of 45 °, and when the excitation is large, respectively. The amplitude value at resonance of the human eye at 134 Hz is 35μm, 48μm and 133μm, respectively. When the position and size of the excitation source and material parameters are fixed and the intraocular pressure is changed, the first-order resonance frequency is almost unaffected by the intraocular pressure, and the resonance frequencies of other orders will shift slightly to the left as the intraocular pressure increases, and the offset frequency value is smaller. When the location and size of the excitation source, intraocular pressure and corneal elasticity remain certain, and the scleral elastic parameters are changed, the resonance frequency of the human eye tissue increases with the increase of the scleral elasticity. Conclusion: The position and size of the excitation source have no effect on the resonance frequency of the human eye, but they have a greater effect on the the amplitude value at resonance. The material parameters of the human eye tissue have a greater effect on the frequency response, but the intraocular pressure has almost no effect.