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Reduction of myopia from corneal refractive therapy
Luigina Sorbara1, Desmond Fonn, Trefford Simpson
1Centre for Contact Lens Research, School of Optometry, University of Waterloo, Waterloo, Ontario, Canada. gsorbara@uwaterloo.ca
Summary
Corneal refractive therapy (CRT) lenses effectively reduced myopia and improved vision within 4 weeks. Maximal effects were observed by day 10 and sustained, with some lasting changes even after lens discontinuation.
Area of Science:
- Ophthalmology
- Optometry
- Corneal Refractive Therapy
Background:
- Myopia, a common refractive error, affects visual acuity.
- Corneal refractive therapy (CRT) offers a non-surgical approach to myopia management.
Purpose of the Study:
- To evaluate the efficacy of CRT lenses in reducing myopia over a 4-week period.
- To assess changes in refractive error, keratometry, and visual acuity with CRT lens wear.
Main Methods:
- Twenty-three myopic participants wore CRT HDS lenses nightly.
- Refractive error and keratometry were measured using an autokeratorefractometer.
- Visual acuity (high and low contrast) and subjective vision were assessed at multiple time points.
Main Results:
- Significant reduction in myopic spherical equivalent refractive error, averaging 2.59 D by day 28.
- Uncorrected visual acuity improved to 0.00 LogMAR (6/6) by day 4 and was maintained.
- Central corneal curvature flattened, and subjective vision improved significantly throughout the study.
Conclusions:
- CRT lenses are effective in reducing myopia and enhancing visual acuity.
- Maximal therapeutic effects were achieved by 10 days and sustained through 28 days.
- Corneal changes and visual improvements persisted, with incomplete recovery after 72 hours of lens discontinuation.