Coleman D J, Fish S K
Department of Ophthalmology, The New York Presbyterian Hospital-Weill Medical College of Cornell University, New York, New York 10021, USA.
Ophthalmology. 2001 Sep;108(9):1544-51. doi: 10.1016/s0161-6420(01)00691-1.
To demonstrate a plausible explanation of aging changes and to reduce the controversy relative to accommodation by using a mechanical model of the catenary theory of lens change. MECHANICAL MODELING: A mechanical model was used to simulate a human lens in both the accommodated and unaccommodated state to demonstrate changes in the mechanism of accommodation with age.
Fluid-filled latex balloons were supported by a plastic wrap hammock to form a catenary that models the human lens. Increasing volumes were used to simulate that of the aging lens, and variations in curvature were measured.
The degree of curvature of a simulated anterior lens surface was measured and compared with mathematical modeling of its optical surface based on the catenary hydraulic suspension theory.
The measurements showed that accommodative loss and other features such as mass displacement, reproducible lens surfaces, and zonule support are consistent with the catenary theory of accommodation and an increasing lens volume with age.
The catenary theory of accommodation provides a basis for evaluating age changes of the human lens. Variable results with surgical procedures for presbyopia are also predictable with the model. These results can be used to provide a basis for intraocular lens design.
通过使用晶状体变化悬链线理论的力学模型，对衰老变化进行合理的解释，并减少与调节相关的争议。力学建模：使用力学模型模拟人眼晶状体在调节和非调节状态下的情况，以展示随着年龄增长调节机制的变化。
用保鲜膜吊床支撑充液乳胶气球，形成模拟人眼晶状体的悬链线。使用增加的体积来模拟衰老晶状体的体积，并测量曲率变化。
测量模拟晶状体前表面的曲率程度，并与基于悬链线液压悬浮理论的光学表面数学模型进行比较。
测量结果表明，调节功能丧失以及其他特征，如质量位移、可重复的晶状体表面和小带支撑，与调节的悬链线理论以及晶状体体积随年龄增加是一致的。
调节的悬链线理论为评估人眼晶状体的年龄变化提供了基础。该模型还可预测老花眼手术的不同结果。这些结果可为人工晶状体设计提供依据。
