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Related Experiment Videos

Corneal refractive therapy, uncorrected visual acuity, and "E" values: personal experiences.

Russell Lowe1

  • 1University of Melbourne, Cardigan and Keppel, Melbourne, Victoria 3053, Australia. r.lowe@optometry.unimelb.edu.au

Eye & Contact Lens
|October 23, 2004
PubMed
Summary

Orthokeratology lenses, including Paragon corneal refractive therapy (CRT) and Mountford BE, effectively reduce myopia overnight. Paragon CRT offers an advantage by not needing an initial lens trial.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Refractive Therapy

Background:

  • Orthokeratology lenses offer a temporary solution for myopia reduction.
  • This study examines the clinical experience with two proprietary corneal remodeling systems: Paragon corneal refractive therapy (CRT) and Mountford BE lenses.
  • Videokeratography (VK) precision in determining corneal sagittal depth is also evaluated.

Observation:

  • A retrospective analysis of 25 candidates (50 eyes) using Keratron videokeratography data was performed.
  • 16 patients fitted with Paragon CRT lenses were compared to age- and sex-matched patients fitted with Mountford BE lenses.
  • Uncorrected visual acuity was assessed at 1-day, 1-week, and 1-month intervals.

Findings:

  • Both Paragon CRT and Mountford BE lenses demonstrated significant reductions in uncorrected visual acuity after one night of wear.

Related Experiment Videos

  • Paragon CRT lenses targeted a mean myopia of -1.71 +/- 0.71 diopters, achieving 20/20 +/- 20/0.86 visual acuity.
  • Mountford BE lenses targeted a mean myopia of -2.30 +/- 0.89 diopters, achieving 20/31 +/- 20/20.6 visual acuity.

    • Implications:

    • Orthokeratology lens wear provides rapid visual acuity improvement for myopia reduction.
    • The Paragon CRT system streamlines the treatment initiation process by eliminating the need for an initial overnight lens trial.
    • These findings support the efficacy of overnight orthokeratology for temporary myopia correction.