Joseph Antony S
Institute of Particle Science and Engineering, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
Sci Rep. 2015 Mar 10;5:8899. doi: 10.1038/srep08899.
Healthy eyes are vital for a better quality of human life. Historically, for man-made materials, scientists and engineers use stress concentration factors to characterise the effects of structural non-homogeneities on their mechanical strength. However, such information is scarce for the human eye. Here we present the shear stress distribution profiles of a healthy human cornea surface in vivo using photo-stress analysis tomography, which is a non-intrusive and non-X-ray based method. The corneal birefringent retardation measured here is comparable to that of previous studies. Using this, we derive eye stress concentration factors and the directional alignment of major principal stress on the surface of the cornea. Similar to thermometers being used for monitoring the general health in humans, this report provides a foundation to characterise the shear stress carrying capacity of the cornea, and a potential bench mark for validating theoretical modelling of stresses in the human eye in future.
健康的眼睛对于提高人类生活质量至关重要。从历史上看，对于人造材料，科学家和工程师使用应力集中系数来表征结构不均匀性对其机械强度的影响。然而，关于人眼的此类信息却很少。在此，我们使用光应力分析断层扫描技术展示了健康人眼角膜表面在体内的剪应力分布情况，这是一种基于非侵入性且非X射线的方法。此处测量的角膜双折射延迟与先前研究的结果相当。利用这一结果，我们推导出了眼应力集中系数以及角膜表面主应力的方向排列。类似于温度计用于监测人体总体健康状况，本报告为表征角膜的剪应力承载能力奠定了基础，并为未来验证人眼应力理论模型提供了一个潜在的基准。
