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Related Experiment Videos

Enhancing RGP contact lens performance: comparing back surface options.

Barbara A Fink1, G Lynn Mitchell, Thomas W Raasch

  • 1The Ohio State University, College of Optometry, Columbus 43218-2342, USA. hill.30@osu.edu

Optometry (St. Louis, Mo.)
|November 1, 2002
PubMed
Summary
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Aspheric rigid gas-permeable (RGP) contact lens designs vary in their ability to improve tear exchange and reduce hypoxia. No single design was found to be universally superior for all patients.

Area of Science:

  • Ophthalmology
  • Biomaterials Science
  • Optometry

Background:

  • Rigid gas-permeable (RGP) contact lenses are crucial for refractive correction in some cases.
  • High Dk RGP materials mitigate hypoxia, while aspheric designs may enhance tear circulation.
  • Optimized post-lens tear exchange is vital for nutrient delivery and waste removal.

Purpose of the Study:

  • To compare the post-lens tear exchange efficiency of four aspheric back surface RGP designs against a spherical reference design.
  • To evaluate the effectiveness of these designs in reducing post-lens hypoxia under non-blink and blink conditions.

Main Methods:

  • Evaluated five RGP lens back surface designs (four aspheric, one spherical) fitted to eight eyes.
  • Measured oxygen uptake rates to assess post-lens hypoxia reduction.

Related Experiment Videos

  • Quantified tear exchange using exchange efficiency (EE) units under blinking and non-blinking conditions.

    • Main Results:

    • Aspheric designs showed a range of combined EE scores from +13.9 to +2.5, compared to +8.9 for the spherical design.
    • Individual eye tear pump efficiency varied widely, from +12.3 to -9.8 EE units.
    • The highest recorded EE score was +28.4, and the lowest was -13.8 across all combinations.

    Conclusions:

    • Significant variations exist in the post-lens exchange efficiency of aspheric and peripheral curve RGP lens designs.
    • No single investigated design provided a universal solution for optimizing post-lens tear exchange and reducing hypoxia.