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Ortho K Lenses

More about different types of Contact LensesOrtho K Lenses

What are Orthokeratology / Ortho-K Lenses?

Orthokeratology (ortho-k) fits specially designed gas permeable contact lenses that you wear overnight. These lenses gently reshape the front surface of your eye (cornea) while you are asleep, so you can see the following day after you remove the lenses. Ortho-Ks is a revolutionary FDA approved non-surgical procedure that eliminates the need for glasses or daytime contact lenses. It is a great alternative to Lasik for those not ready for surgery.

Ortho-K is not as new as you think. Ortho-K is often discussed as a recent or even brand-new innovation in optometry. The technique has its roots in scientific discoveries from the 1940s.

These lenses are prescribed for two purposes:

  • To correct refractive errors (primarily near-sightedness, but also astigmatismand far-sightedness). In some cases, ortho-k also is used to correct presbyopia.
  • To slow the progression of childhood myopia.

Ortho-k lenses are also called “corneal reshaping contact lenses” or “overnight contact lenses to correct or control myopia.”

How do Ortho-K lenses work?

When a person can not see clearly, their eye is too long, too short, or the surface is misshaped. Images fail to reach or focus on the retina, which produces blurred or distorted vision.

The surface of your eyes is mapped using a high tech instrument called a topographer, which allows your doctor to create a custom lens specifically designed for your eye and its unique visual problem. These contact lenses are made of highly oxygen permeable material, which allows your eye to breathe overnight and maintain excellent health.

This corneal reshaping lens has several specialised curves that reshape your cornea (front surface of your eye). The tear film beneath this therapeutic lens continuously flows across the corneal surface, re-sculpting the shape. This improved shape focus images directly on the retina. The result is crisp, clear vision upon waking and removing your lenses.


Ortho-K lenses are custom-made to the specifications prescribed by your eye doctor when they perform all the tests and fitting to provide the best possible vision, eye health and comfort.

For these reasons, professional fees associated with fitting ortho-k lenses and lens replacement costs are higher for ortho-K lenses than other contact lenses and varies with different brands.

Frequently asked Questions ?

How do I maintain my improved vision with Ortho K Lenses ?
You will continue wearing your ortho-K lenses at night. Similar to wearing retainer on your teeth after braces Theses specially designed lenses act like a retainer for your eyes.

How long does it take for vision to improve?
It can take two weeks or longer to attain the maximum vision correction from orthokeratology, although some people experience significant vision improvement in days.

How long does the Ortho K effect last ?
You should be able to see acceptably well without glasses or contact lenses for a day or two, sometimes longer. For best results, you should wear the ortho-k lenses every night.

Are Ortho K Lenses safe ?
Ortho-K is a very safe and reversible procedure. It was approved by the FDA in 2002. However, as with ay Contact lens wear, there is a small risk, most typically a minor infection easily addressed by antibiotic drops. This risk is greatly minimised by adopting a regime of very careful cleaning and disinfecting, by wearing the lenses as prescribed by your doctor and maintaining the necessary progress visits.

Is corneal reshaping permanant ?
Unlike refractive surgery Corneal reshaping is temporary and reversible. If you decide to stop wearing Ortho-K lenses your vision will gradually go back to what it was before you started reshaping your cornea overnight.

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