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• W2122321810 abstract "The effects of material properties and equatorial stretching forces on the stress distribution and shape profile of human lenses were investigated to see whether support could be found for either or both current theories of accommodation. Finite element analysis was used to create models using shape parameters and material properties from published data. Models were constructed for two lenses of different ages. Material properties were varied to show differences between models with a single elastic modulus and those with different moduli for the cortex and the nucleus. Two levels of stretching forces were applied at the equator. Comparisons between experimental and model profiles were made, and stress distribution patterns were constructed. In all models, stretching produces a flattening in the peripheral curvature of the lens. In the younger lens, model and experimental results show that central curvature at some points is steeper for stretched than for unstretched profiles. In the older lens, gradients are flatter at all central points for stretched model and experimental profiles compared to the unstretched profile. In all models, there is a region of higher stress distribution within the lens that corresponds with the position of an inflection point that appears on the anterior surface and, in the older lens, also on the posterior surface. The results show that equatorial stretching forces can produce shape changes in support of both current theories of accommodation depending on the lens age, shape, and applied force." @default.
• W2122321810 created "2016-06-24" @default.
• W2122321810 creator A5027049932 @default.
• W2122321810 creator A5030818694 @default.
• W2122321810 date "2007-08-03" @default.
• W2122321810 modified "2023-09-24" @default.
• W2122321810 title "Modeling internal stress distributions in the human lens: Can opponent theories coexist?" @default.
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• W2122321810 doi "https://doi.org/10.1167/7.11.1" @default.
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• W2122321810 hasPublicationYear "2007" @default.
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