This, in turn, may result in high patient satisfaction accompanied by long lasting loyalty.
Recent studies have revealed that orthokeratology may slow down the myopia progression. To enhance its effectiveness, SwissLens has made a calculator thanks to which OrthoK design for myopic kids can be now supported with the Relax system.
Back optic zone: spherical with reversed zone and aspherical flattening
Front optic zone: spherical
Parameter | from | to | steps |
---|---|---|---|
Total diameter | 10.00 mm | 12.00 mm | 0.01 mm |
Base curve | 7.50 mm | 10.50 mm | 0.01 mm |
Alignment zone curve | 7.00 mm | 8.40 mm | 0.01 mm |
Sphere (CL) | -1.00 dpt | +2.00 dpt | 0.01 dpt |
Eccentricity | 0.10 | 0.90 | 0.01 |
Sphere (target) | -9.00 dpt | +3.50 dpt | 0.01 dpt |
Astigmatism | -0.50 dpt | -2.50 dpt | 0.01 dpt |
Addition | +0.50 dpt | +3.00 dpt | 0.01 dpt |
Application | |
---|---|
Indication | |
Correction type | |
Lens Type | |
Designed by | SwissLens |
In its white paper (1), the International Myopia Institute (IMI) recommends optimising OrthoK for myopia management, i.e. the optic zone diameter should be individualised so that the size of the reverse treatment zone is smaller than the child’s pupil diameter.
This modification of the optic zone can be implemented relatively easily by us as contact lens manufacturers.
Dr. Michaud Langis recommends using OrthoK only for myopia management in myopia larger than -2.50 dpt, otherwise the defocus caused by the induced peripheral addition in the reverse zone (which is equal to the corrected myopia) is not sufficiently corrected and thus the effect is not sufficient for myopia control (2).
Unfortunately, this aspect is in contrast to our desire to provide OrthoK to myopic children as early as possible in the myopia management process. OrthoK not only has a control effect, but also gives the child the freedom to see clearly all day long without visual aids.
SwissLens, specialised in individual contact lenses for myopia management for over 10 years, has developed a completely new back surface design for OrthoK NightFlex. With this design the reverse zone starts earlier than usual, but has a higher compression factor in the reverse zone. This compression makes it possible to correct the myopia and increase the induced addition as needed.
This is basically similar to the soft or rigid Relax contact lenses. Here you can freely choose the size of the zone and the amount of addition to correct the hyperopic defocus according to your needs and your measurements.
When ordering, please give us the age, pupil size and, if possible, the accommodation accuracy in addition to the usual corneal and refraction parameters.
Good luck with the treatment of progressive myopic children!
Calculation tools: toolbox.swisslens.ch
New NightFlex Order FORM
(1) https://iovs.arvojournals.org/article.aspx?articleid=2727315
(2) https://www.clspectrum.com/issues/2017/september-2017/myopia-control-with-ortho-k
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