Related Experiment Video
Updated: Jun 9, 2025
05:19
Author Spotlight: Advancing Understanding of Age-Related Lens Stiffness Changes
Published on: April 5, 2024
2.2K
Influence of Contact Lens Parameters on Cornea: Biomechanical Analysis
Darshan Ramasubramanian1,2, José Luis Hernández-Verdejo1, José Manuel López-Alonso1
1Faculty of Optics and Optometry, Complutense University of Madrid, Arcos de Jalón 118, 28037 Madrid, Spain.
Bioengineering (Basel, Switzerland)
|October 25, 2024
Summary
Finite element analysis reveals that increasing contact lens stiffness (Young's modulus) significantly reduces corneal stress during eye closure, enhancing comfort and safety. Other parameters like base curve and diameter have minimal impact on stress distribution.
Area of Science:
- Ocular biomechanics
- Biomaterials science
- Computational mechanics
Background:
- Modeling ocular biomechanics is crucial for understanding contact lens (CL) interactions.
- The closed-eye state poses experimental challenges for analyzing the CL-corneal interface.
- Simulation tools offer a valuable alternative for accurate characterization.
Purpose of the Study:
- To model the biomechanical interactions between the human eye and CLs in the closed-eye condition.
- To investigate CL folding, twisting, and their effects on the cornea.
- To assess the influence of CL parameters on corneal stress and lens fit.
Main Methods:
- Finite element analysis (FEA) was employed to simulate ocular biomechanics.
- The study modeled the human eye and CLs under closed-eye conditions.
- Parametric variations of CL properties were analyzed.
Main Results:
- Increasing Young's modulus of CLs significantly reduced corneal stress.
- Higher Young's modulus promoted uniform stress distribution, enhancing wearer comfort and safety.
- Variations in base curve and diameter primarily affected contact area, with minimal impact on stress distribution.
Conclusions:
- Young's modulus is the most critical parameter for CL comfort and safety in the closed-eye state.
- FEA provides valuable insights into CL-corneal interactions.
- Findings can guide the design of safer and more comfortable contact lenses.
