Bryant M R, McDonnell P J
Doheny Eye Institute and Department of Ophthalmology, University of Southern California School of Medicine, Los Angeles 90033, USA.
J Biomech Eng. 1996 Nov;118(4):473-81. doi: 10.1115/1.2796033.
Membrane inflation tests were performed on fresh, intact human corneas using a fiber optic displacement probe to measure the apical displacements. Finite element models of each test were used to identify the material properties for four different constitutive laws commonly used to model corneal refractive surgery. Finite element models of radial keratotomy using the different best-fit constitutive laws were then compared. The results suggest that the nonlinearity in the response of the cornea is material rather than geometric, and that material nonlinearity is important for modeling refractive surgery. It was also found that linear transverse isotropy is incapable of representing the anisotropy that has been experimentally measured by others, and that a hyperelastic law is not suitable for modeling the stiffening response of the cornea.
使用光纤位移探头对新鲜、完整的人角膜进行膜膨胀试验，以测量顶点位移。每个试验的有限元模型用于确定通常用于模拟角膜屈光手术的四种不同本构定律的材料特性。然后比较使用不同最佳拟合本构定律的放射状角膜切开术的有限元模型。结果表明，角膜反应中的非线性是材料性而非几何性的，并且材料非线性对于模拟屈光手术很重要。还发现线性横向各向同性无法表示其他人通过实验测量的各向异性，并且超弹性定律不适用于模拟角膜的硬化反应。
