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Related Experiment Videos

Post radial keratotomy RGP fitting--a case study.

M P Simunovic1

  • 1Cambridge University, Cambridge CB3 0AG, UK.

Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association
|January 1, 1997
PubMed
Summary
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Radial keratotomy (RK) surgery alters corneal shape, making rigid gas permeable (RGP) lens fitting difficult. Orthokeratology (Ortho-K) lenses, with steeper back peripheral radius designs, may offer a better fit for post-RK patients.

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Surgery

Background:

  • Radial keratotomy (RK) surgery results in abnormal corneal topography, characterized by a flatter central cornea compared to the periphery.
  • Fitting rigid gas permeable (RGP) lenses on post-RK patients presents significant challenges due to these topographical changes.

Purpose of the Study:

  • To evaluate the potential of Orthokeratology (Ortho-K) lenses for fitting post-radial keratotomy (RK) patients.
  • To compare the suitability of Ortho-K lenses with conventional RGP lenses for this patient group.

Main Methods:

  • The study proposes utilizing Ortho-K lenses, which have a steeper back peripheral radius (BPR) than their back optic zone radius (BOZR).
  • This unique design is contrasted with standard RGP lens designs.

Related Experiment Videos

Main Results:

  • Ortho-K lenses possess a back peripheral radius (BPR) steeper than the back optic zone radius (BOZR).
  • This specific design characteristic is hypothesized to improve lens fitting in post-RK corneas.

Conclusions:

  • The specialized design of Ortho-K lenses, particularly their steeper BPR, may offer a more suitable alternative for fitting post-RK patients.
  • Further investigation is warranted to confirm the efficacy of Ortho-K lenses in improving RGP lens fitting for individuals who have undergone radial keratotomy.