分析角膜生物力学响应在脊椎病理学与不同的背光区直径:一个比较的有限元素研究
PeiPei Zhang1, XinYu Zhang1, XueFei Li1
1National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China.
概括
带有较小背光区直径 (BOZD) 的正视科 (ortho-k) 镜头会产生缩的角膜接触,减少治疗区域的大小. 这种效应在近视纠正过程中不会显著增加角膜最大应力.
科学领域:
- 眼科医生 眼科 眼科
- 生物机械工程 生物机械工程
- 眼镜测量是指眼睛的测量.
背景情况:
- 整形肌科 (ortho-k) 是一种使用专用隐形眼镜的非手术折射校正方法.
- 了解透镜设计参数的生物力学影响对于优化治疗结果至关重要.
研究的目的:
- 分析 ortho-k 镜片的不同后光区直径 (BOZD) 如何影响角膜生物力学.
- 为了研究对角膜接触压力,位移和应力分布的影响.
主要方法:
- 有限元模型模拟了不同角膜曲率和ortho-k透镜设计,以减少近视 (-2.0D至 -6.0D).
- 模型包含两个BOZD值 (5.0毫米和6.0毫米) 来评估它们的影响.
- 计算了包括接触压力,位移,机械处理区 (MTZ) 直径和·米塞斯应力在内的关键生物力学参数.
主要成果:
- 具有5.0毫米BOZD的镜头比具有6.0毫米BOZD的镜头显示出更高的中心接触压力和角膜位移.
- 5.0毫米的BOZD组具有较小的中央接触范围,角膜重塑区域和MTZ直径.
- 视角膜最大应力降低了镜头应用后,在6.0毫米BOZD组中减少更为明显.
结论:
- 后光区直径 (BOZD) 是ortho-k生物机械效应的一个关键因素.
- 较小的BOZD镜头集中角膜接触,导致较小的治疗区域,而不会显著增加角膜峰值应力.
相关概念视频
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
Bending of Members Made of Several Materials
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...


