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Orthokeratology (Ortho-k), or Corneal Reshaping Therapy (CRT)

Empress Eye Clinic offers Ortho-k as an effective technique for myopia control in children to reduce the progression of their myopia(nearsightedness) and risk of other eye diseases later in their lives.

We also offer Orthokeratology (Ortho-K), as a non-surgical treatment option for both Myopia Control for children and young adults, and for people suffering from mild to moderate myopia astigmatism and presbyopia. Ortho k is a safer and reversible alternative treatment for people that are not a good candidate for refractive surgeries such as LASIK, PRK, SMILE, and CONTOURA.

What is Ortho-k?

Orthokeratology also referred to, Corneal Refractive Therapy (CRT) or Overnight Vision Correction, is a unique revolutionary technology that utilizes custom-fitted, oxygen-permeable rigid contact lenses to improve vision through the reshaping of cornea while you sleep. Simply remove your lenses in the morning and enjoy clear vision without wearing glasses or contact lenses during the day.

How Does Ortho-k Work?

The principle is similar to the use of a dental retainer used by an orthodontist to realign crooked teeth.

Ortho K uses advanced technology to reshape the surface of your eyes. A precisely shaped vision retainer Gas Permeable (GP) contact lens, uniquely designed for your individual eye shape, places gentle pressure over a layer of tear film on your cornea during sleep by a pre-determined amount to correct your eyesight prescription. While you sleep, the lenses gently reshape the front surface of your eye (the cornea) to correct your vision, so you can see clearly without glasses or contact lenses when you're awake. The effect is temporary - generally enough to get you through a day or two - so you must wear the reshaping lenses each night to maintain good vision during the day.

Who Is A Candidate For Ortho-k?

Orthokeratology (Ortho-k), is a safe and effective method of correcting vision while slowing the progression of myopia in children. If you are the parent of a nearsighted child, learn how Ortho-k can also help preserve your child’s eye health.

Orhokeratology for Adults
Orthokeratology is frequently a good option for nearsighted individuals who are too young for LASIK surgery or for some other reason are not good candidates for vision correction surgery. Because it can be discontinued at any time without permanent change to the eye, people of any age can try the procedure, as long as their eyes are healthy.

Orthokeratology for Athletes
Ortho-k overnight lenses provide a perfect solution for athletes with myopia. They eliminate the need for wearing glasses or contact lenses during the day while ensuring stable, clear vision and safety when playing sports.

Ortho-k is also appealing for people who work in dusty, dirty environments that can make regular contact lens wear difficult.

What Results Can You Expect From Ortho-k?

The goal for ortho-k is to correct your vision to 20/20 without the need for eyeglasses or contact lenses during the day. In FDA trials of both CRT and VST lenses, more than 65% of patients were able to achieve 20/20 visual acuity after wearing the reshaping lenses overnight. More than 90% were able to see 20/40 or better (the legal vision requirement for driving without glasses in most states).

Success rates for ortho-k tend to be higher for mild prescriptions. Call our office to find out if your prescription is within the range that can be successfully treated with ortho-k.

How Long Does Ortho-k Take?

Though you may see some improvement in your vision after a day or two of overnight ortho-k, it can take several weeks for the full effect to be apparent. During this time, your vision will not be as clear as it was with glasses or contacts, and you are likely to notice some glare and halos around lights. It's possible you may need a temporary pair of eyeglasses for certain tasks, like driving at night, until your vision is fully corrected by the ortho-k lenses.

Is Ortho-k Comfortable?

Some people have comfort issues when attempting to wear gas permeable contact lenses during the day. But since ortho-k GP lenses are worn during sleep, comfort and lens awareness are generally not a problem.

Cost Of Orthokeratology

Ortho-k is a significantly longer process than a regular contact lens fitting. It requires a series of office visits and potentially multiple pairs of lenses. Also, GP lenses used for ortho-k are more costly than most regular contact lenses. Therefore, fees for orthokeratology are higher than fees for regular contact lens fittings. Currently the cost is $2500 and in some cases more for the fist year including a pair of finalized specially designed retainer contact lenses and all professional fees for the first year. The cost reduces to $1500 for the 2nd year and after. Fees are subject to change without notice.

Can I Have LASIK After Ortho-k?

Yes, it's possible to have LASIK surgery after orthokeratology. But because ortho-k lenses reshape your cornea, you must stop wearing the lenses for a period of time (usually several months) so your eyes can return to their original shape and stabilize. Be sure to tell your LASIK surgeon that you've worn ortho-k lenses, so they can advise you how long you should wait before having the surgery.

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OHIP Exams Update

As of November 23, 2021, Ontario Government agreed with a formal negotiation and Ontario optometrists agreed to resume service for OHIP insured patients during the negotiations. We do our best to accommodate as many patients we could. We started booking from our long waiting list that has been built up since September. We continue adding patients to our list and try to see as many patients as possible without compromising our high quality eye care services.

If you wish to be added to our waiting list please kindly use our online appointment request form. We really appreciate your patience, understanding and support! In the meantime please visit and let the government know you care about your eye care and this is the government’s responsibility to pay for your eye care, not your optometrist.