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Related Experiment Videos

Factors determining rigid contact lens flexure

J C Corzine1, S A Klein

  • 1Neurometrics Institute, Berkeley, California, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1997
PubMed
Summary

Rigid contact lens flexure is minimal when ample fluid is present. Clinically significant flexure occurs when postlens fluid volume increases and fluid is scarce, with surface tension maintaining rather than creating this rigid lens flexure.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Materials Science

Background:

  • Factors influencing rigid contact lens flexure are known, but surface tension and eyelid forces remain poorly understood.
  • Understanding rigid lens flexure is crucial for optimizing contact lens design and patient comfort.

Purpose of the Study:

  • To investigate the roles of surface tension and eyelid forces in rigid contact lens flexure.
  • To develop a model explaining the conditions leading to significant rigid lens flexure.

Main Methods:

  • A model eye with a flexible polymethyl methacrylate (PMMA) base was used to measure lens flexure.
  • Videokeratoscopy was employed to quantify flexure under varying conditions.
  • Parameters such as base toricity, measurement sequence, lens base curve, and fluid evaporation were manipulated.

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Main Results:

  • Clinically significant flexure (>0.50 D) was observed when the postlens space volume increased upon lens unfolding and fluid was limited.
  • Minimal flexure (≤0.50 D) occurred when ample fluid was available to fill the postlens space.
  • Evaporation of postlens fluid was also observed to influence flexure.

Conclusions:

  • Surface tension primarily maintains, rather than initiates, rigid lens flexure.
  • The developed model explains why steeper-fitting lenses exhibit greater flexure.
  • The model's predictions regarding rigid lens flexure were generally validated.