Assessment of corneal biomechanical properties and their variation with age

被引:322
作者
Elsheikh, Ahmed [1 ]
Wang, Defu
Brown, Michael
Rama, Paolo
Campanelli, Marino
Pye, David
机构
[1] Univ Dundee, Div Civil Engn, Dundee DD1 4HN, Scotland
[2] Hosp San Raffaele, Dept Ophthalmol, I-20132 Milan, Italy
[3] Monza Eye Bank, Monza, Italy
[4] Univ New S Wales, Sch Optometry & Vis Sci, Sydney, NSW, Australia
关键词
aging; ocular biomechanics; stress-strain behavior;
D O I
10.1080/02713680601077145
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Purpose: The aim of this study was to determine the stress-strain behavior of corneal tissue and how the behavior was affected by age. Methods: Human corneal specimens ranging in age between 50 and 95 years were tested under inflation conditions to determine their stress-strain behavior. The corneas were subjected to two load rates that represent dynamic and static loading conditions. The pressure-deformation results were analyzed using shell theory to derive the stress-strain behavior. Results: The corneas demonstrated clear nonlinear behavior with an initial low stiffness stage and a final high stiffness stage. The transition between the two stages coincided with intraocular pressures between 12 and 20 mmHg. There was a considerable increase in stiffness associated with both age and load rate. Equations were derived to describe the nonlinear stress-strain relationship of corneal tissue for any age between 50 and 95 ears, and these equations are presented in a form suitable for use in numerical simulations. Conclusions: The cornea demonstrates considerable stiffening with age with the behavior closely fitting an exponential power function typical of collagenous tissue. The increase in stiffness could be related to the additional age-related nonenzymatic cross-linking affecting the stromal collagen fibrils.
引用
收藏
页码:11 / 19
页数:9
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