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Related Experiment Videos

Rigid lens dynamics: lid effects

L G Carney1, J C Mainstone, A Carkeet

  • 1School of Optometry and Centre for Eye Research, Queensland University of Technology, Australia.

The CLAO Journal : Official Publication of the Contact Lens Association of Ophthalmologists, Inc
|January 1, 1997
PubMed
Summary
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Lid shape significantly impacts rigid gas permeable lens position and stability. Understanding lid-lens interactions is crucial for successful rigid lens fitting and optimal visual outcomes.

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomechanical Engineering

Background:

  • Rigid gas permeable (RGP) lens centration and stability are influenced by various factors, including lid architecture, tension, blink dynamics, and blink rate.
  • Understanding these interactions is key to optimizing RGP lens wear and patient satisfaction.

Purpose of the Study:

  • To investigate the relationship between eyelid geometry and the position of RGP lenses on the eye.
  • To examine how lens-lid interactions affect the association between lens position, center of gravity, and mass.

Main Methods:

  • Eight subjects with either high-riding or low-riding lenses were included.
  • Twelve lenses (six designs in two materials) were fitted per subject.
  • Lens dynamics (initial position, settled position, movement, and rate of movement) were assessed over five blinks.

Related Experiment Videos

  • Lower lid position and palpebral aperture height were measured.

    • Main Results:

    • A low upper lid position and narrow palpebral aperture were associated with superior lens decentration.
    • A high upper lid position and wide palpebral aperture predisposed to inferior lens decentration.
    • Significant upper lid overlap was common with high-riding lenses; lid interaction reduced the gravitational stabilization effect on lenses.

    Conclusions:

    • Eyelid geometry plays a significant role in determining RGP lens centration and stability.
    • Lid-lens interactions can modify the influence of lens design and mass on lens positioning.
    • Clinicians should consider potential lens-lid interactions before fitting RGP lenses to ensure optimal outcomes.