Hatami-Marbini Hamed
Mechanical and Industrial Engineering Department, University of Illinois Chicago, Chicago, IL 60607, USA.
Vision (Basel). 2025 Jan 4;9(1):1. doi: 10.3390/vision9010001.
The present work characterized the effects of hydration on the viscoelastic tensile properties of the sclera. Scleral strips were dissected from the posterior region near the optic nerve head of porcine eyes in the superior-inferior direction. The samples were divided into four hydration groups and their mechanical response was characterized by conducting uniaxial tensile stress-relaxation experiments. An exponential relation and logarithmic expression were used to numerically represent the experimental measurements during the ramp and relaxation periods, respectively. A nonlinear increase in the tensile stress during the ramp period was observed for all strips. Furthermore, it was found that dehydrated specimens had stiffer tensile properties. In particular, it was observed that the maximum and equilibrium stresses increased significantly with decreasing hydration. Furthermore, it was found that the viscoelastic tensile response of porcine scleral strips at different hydration levels could be collapsed onto a single normalized curve. The findings of the present work showed that hydration had significant effects on the viscoelastic tensile properties of sclera.
本研究表征了水合作用对巩膜粘弹性拉伸性能的影响。沿猪眼视神经乳头附近的后区域，在上下方向上切取巩膜条。将样本分为四个水合组，并通过进行单轴拉伸应力松弛实验来表征其力学响应。分别使用指数关系和对数表达式对斜坡加载期和松弛期的实验测量值进行数值表示。所有巩膜条在斜坡加载期均观察到拉伸应力呈非线性增加。此外，发现脱水标本具有更硬的拉伸性能。具体而言，观察到最大应力和平衡应力随着水合作用降低而显著增加。此外，发现不同水合水平下猪巩膜条的粘弹性拉伸响应可汇聚到一条单一的归一化曲线上。本研究结果表明，水合作用对巩膜的粘弹性拉伸性能具有显著影响。
