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Finite element model of cornea deformation
Jessica R Crouch1, John C Merriam, Earl R Crouch
1Computer Science Dept., Old Dominion University, VA, USA. jrcrouch@odu.edu
Medical Image Computing and Computer-Assisted Intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention
|May 12, 2006
Summary
Cornea curvature changes after cataract surgery can cause astigmatism. A new biomechanical model shows eye muscle forces and intra-ocular pressure counteract each other, influencing corneal shape and contributing to astigmatism.
Area of Science:
- Ophthalmology
- Biomechanical Engineering
- Computational Modeling
Background:
- Corneal curvature changes and induced astigmatism are known complications following cataract surgery.
- Surgical incision placement is a recognized factor influencing post-operative corneal shape.
- Previous studies relied on empirical data, lacking predictive biomechanical models.
Purpose of the Study:
- To implement a finite element model to predict corneal shape changes after surgery.
- To investigate the influence of eye muscle forces and intra-ocular pressure on corneal curvature.
- To understand the biomechanical factors contributing to post-surgical astigmatism.
Main Methods:
- Development of an incised finite element model of the human eye.
- Simulation of intra-ocular pressure and extra-ocular muscle forces acting on the cornea.
- Computation of cornea shape changes using finite element analysis.
- Measurement of corneal curvature changes by fitting quadratic curves to meridians.
Main Results:
- Simulated forces of intra-ocular pressure and eye muscles act in opposition.
- These opposing forces result in predictable changes in corneal curvature.
- The model quantifies the contribution of these forces to induced astigmatism.
Conclusions:
- A biomechanical finite element model can predict corneal shape changes post-surgery.
- Eye muscle forces and intra-ocular pressure are key biomechanical factors influencing corneal curvature.
- Understanding these forces is crucial for mitigating post-operative astigmatism.
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