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Related Experiment Videos

Visual performance after overnight orthokeratology.

Kate L Johnson1, Leo G Carney, John A Mountford

  • 1School of Optometry and Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia. kjkatejohnson@gmail.com

Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association
|January 12, 2007
PubMed
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Orthokeratology improves unaided vision and reduces myopia without significantly impacting visual acuity or contrast sensitivity. Visual performance remains stable throughout the day, with refractive error stabilizing after one week of lens wear.

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Physiology

Background:

  • Orthokeratology (OK) is a non-surgical refractive correction method using specialized contact lenses to reshape the cornea overnight.
  • Understanding the long-term visual performance and potential deficits after OK lens wear is crucial for patient management.

Purpose of the Study:

  • To assess visual performance changes after overnight orthokeratology.
  • To evaluate the regression of the orthokeratology effect and best-corrected vision.
  • To identify any residual visual deficits over a 24-hour period due to altered corneal topography.

Main Methods:

  • Custom BE orthokeratology lenses were fitted to one eye of six subjects, with the fellow eye serving as a control.
  • Visual acuity (high/low contrast, high/low luminance) and contrast sensitivity were measured at baseline, Day 1, and Day 8.

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  • Measurements were taken immediately after lens removal and at 3, 6, and 9 hours post-removal, with and without optimal refraction.

    • Main Results:

    • Orthokeratology significantly improved unaided vision and altered refraction from baseline.
    • No significant changes were observed in visual acuity under various contrast/luminance conditions or in contrast sensitivity.
    • Spherical refractive error showed daily regression, stabilizing by Day 8, with no significant changes in best-corrected acuity.

    Conclusions:

    • Orthokeratology effectively improves unaided vision and corrects myopia without compromising visual acuity or contrast sensitivity.
    • Visual performance remained stable throughout the day, indicating no significant induced aberrations.
    • The refractive effect of orthokeratology stabilizes within a week, suggesting its suitability for myopia management.