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Updated: Nov 6, 2025
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Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher
Published on: February 23, 2018
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A numerical investigation of changes in lens shape during accommodation
I Cabeza-Gil1, J Grasa2,3, B Calvo2,3
1Aragón Institute of Engineering Research (i3A), University of Zaragoza, Mariano Esquillor s/n, Zaragoza, 50018, Spain. iulen@unizar.es.
Scientific Reports
|May 6, 2021
Summary
The lens
Area of Science:
- Ophthalmology and Biomedical Engineering
- Biomechanics of the eye
Background:
- Understanding how the eye's lens changes shape during accommodation is crucial for vision science.
- Age-related changes in lens geometry and material properties can affect visual function.
Purpose of the Study:
- To investigate the influence of mechanical properties and geometry on lens shape changes during accommodation.
- To identify key factors governing the accommodative response of the human lens.
Main Methods:
- Simulated ex vivo stretching tests of isolated lenses using finite element analysis.
- Analysis of lens shape changes (radius, thickness, diameter) during simulated accommodation.
- Inclusion of age-related lens geometries (17 and 29 years old) and varying material properties.
Main Results:
- Multiple factors significantly influence lens shape changes during accommodation.
- The stiffness ratio between the lens nucleus and cortex is a predominant factor.
- Capsular stiffness, particularly the posterior surface, significantly impacts accommodative shape changes.
Conclusions:
- Lens mechanical properties, specifically nucleus-cortex stiffness ratio and capsular stiffness, are critical for accommodation.
- Finite element analysis provides valuable insights into the biomechanics of lens accommodation.
- These findings contribute to understanding age-related visual decline and potential interventions.
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