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RGP fitting philosophies for keratoconus.

Karen KY Leung1

  • 1Department of Optometry and Visiojn Sciences, The University of Melbourne, Parkville, Victoria, 3052, Australia.

Clinical & Experimental Optometry
|December 17, 2002
PubMed
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Rigid gas permeable (RGP) lenses are essential for keratoconus management. A modified three-point-touch fitting philosophy, balancing corneal pressure and clearance, offers a practical approach for optimal vision and comfort.

Area of Science:

  • Ophthalmology and Optometry
  • Corneal Disease Management
  • Contact Lens Technology

Background:

  • Rigid gas permeable (RGP) lenses are the primary visual rehabilitation tool for keratoconus.
  • Multiple fitting philosophies exist, leading to ongoing debate regarding the optimal approach.
  • Understanding lens-cornea interaction is crucial for successful RGP lens wear in keratoconic patients.

Purpose of the Study:

  • To review and compare different RGP lens fitting philosophies for keratoconus.
  • To evaluate the rationale, optical performance, and physiological effects of each philosophy.
  • To propose a practical and adaptable fitting strategy for keratoconic patients.

Main Methods:

  • Review of existing literature on RGP lens fitting philosophies for keratoconus.

Related Experiment Videos

  • Analysis of the 'three-point-touch', apical bearing, and apical clearance approaches.
  • Consideration of optical, physiological, and patient-centered factors.

    • Main Results:

    • The 'three-point-touch' philosophy is currently widely accepted for its balanced corneal pressure.
    • Apical bearing and apical clearance philosophies offer distinct advantages.
    • A modified 'three-point-touch' with a tendency towards apical clearance is suggested as a practical solution.

    Conclusions:

    • A modified 'three-point-touch' fitting philosophy, incorporating apical clearance, provides a flexible approach for keratoconus management.
    • This approach accommodates disease progression and potential follow-up limitations.
    • Successful contact lens fitting requires careful consideration of wearing time, visual acuity, and patient comfort.