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Influence of Contact Lens Parameters on Tear Film Dynamics
Darshan Ramasubramanian1,2, José Luis Hernández-Verdejo1, José Manuel López-Alonso3
1Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain.
Bulletin of Mathematical Biology
|February 19, 2025
Summary
Contact lens diameter and Young
Area of Science:
- Ophthalmology and Vision Science
- Biomedical Engineering
- Computational Modeling
Background:
- Contact lens comfort and performance are significantly influenced by the interaction between the lens, tear film, and ocular surface.
- Understanding the dynamics of tear fluid and tear film is crucial for optimizing contact lens design and patient satisfaction.
- Dry eye conditions and individual ocular characteristics can complicate contact lens wear.
Purpose of the Study:
- To computationally model the dynamics of tear fluid and tear film during contact lens motion.
- To investigate the impact of various contact lens parameters (material, design, dimensions) and ocular factors (dry eye, corneal size, blink rate) on tear film dynamics.
- To identify key contact lens characteristics that enhance wearer comfort through improved tear film stability.
Main Methods:
- A computational model was developed to simulate tear fluid and tear film dynamics with contact lens movement.
- Optical measurements from a participant, including tear meniscus size, blink velocity, and palpebral fissure height, were integrated.
- Sixteen contact lens parameters (e.g., Young's modulus, thickness, diameter, curvature) were analyzed using correlation analyses against tear film dynamics.
Main Results:
- Contact lens diameter and Young's modulus demonstrated statistically significant correlations with pre-lens tear film thickness.
- Lens thickness and base curve exhibited weak and non-significant correlations with tear film dynamics.
- These findings highlight the substantial influence of lens diameter and material stiffness on tear film stability.
Conclusions:
- Lens diameter and Young's modulus are critical factors for optimizing pre-lens tear film thickness and stability.
- These parameters play a significant role in enhancing tear fluid distribution and improving overall wearer comfort.
- The study provides valuable insights for advancing custom contact lens design and improving patient outcomes.
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