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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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Laser Refractive Surgery

Do you consider LASIK or other type of refractive surgery to correct your vision? If so make an appointment for pre operative assessment. LASIK and other refractive correction procedures have become more advanced and sophisticated over years. Proper pre operative consultation is very important to make an inform decision before proceeding to the surgery. Several alternative refractive procedures are available, it is therefore essential that the optimal procedure is chosen for each individual patient. Since not all LASIK centres are able to provide all wide range of procedures,  In this context, Dr. Heshmati has teamed up with top laser refractive surgeons in Toronto to offer a full range of refractive surgical corrective options to our patients.

In line with Dr. Heshmati‘s approach to offering an all encompassing range of eye care services we have incorporated refractive surgery in our clinical services. The benefits to our patients is that we are in a position to give unbiased, individualized advice as to the benefits and risks of all modalities of correction based upon the detailed clinical information we have collected during their eye examination.

Custom Bladeless LASIK is performed Using the most advanced LASIK technology available in North America. 

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More About LASIK and Ocular Surgery

woman being examined at our scarborough eye care clinicLASIK and other types of refractive surgery are now an alternative methodof vision correction to spectacles and contact lenses. In line with Dr. Heshmati‘s approach to offering an all-encompassing range of eye care services, we have incorporated refractive surgery in our clinical services. The benefits to our patients are that we are in a position to give unbiased, individualized advice as to the benefits and risks of all modalities of correction based upon the detailed clinical information we have collected during their eye examination.


Custom Bladeless LASIK is performed Using the most advanced LASIK technology available in North America.

SMILE—Small Incision Lenticule Extraction—is the latest innovation in laser vision correction. SMILE eye surgery is a minimally invasive procedure that does not require a corneal flap. It has successfully been performed on over 1 million patients worldwide.


Contoura™ Vision is a topography-guided LASIK treatment designed to provide a more personalized laser procedure for patients with nearsightedness, or nearsightedness with astigmatism, based on the unique corneal topography of each eye. Contoura™ Vision precisely measures up to 22,000 unique elevation points on each of a patient’s eyes.

We will evaluate your eyes and discuss your visual goals to help determine if you are an appropriate candidate for LASIK, PRK or Refractive Lens Exchange. If you have appropriate goals and there are no contraindications for the procedure, we will recommend a pre-operative evaluation to determine suitability for refractive surgery. This evaluation includes:

  • Counseling on refractive surgery options
  • Eye dominancy testing
  • Review of eye history and refractive stability
  • Medical evaluation of the cornea and the eye
  • Current Refraction Status
  • Topography of the cornea
  • Dilated Fondus Examination
  • Pachymetry to check the thickness of the cornea
  • Anterior OCT(Optical Coherence Tomography) test to assess the corneal integrity, thickness and map
  • Posterior OCT test to assess the health of the retina
  • Retinal Imaging test

If after the pre-operative evaluation, the decision is made to proceed with surgery, your information will be forwarded to the surgeon, a pre-surgery consult with your surgeon will be scheduled. Post-operative management will be provided by our doctors at Empress Eye Clinic and includes multiple visits over a period from the date of surgery to include medical evaluation and management of the vision and corneal healing . Evaluation of any additional needs such as reading glasses, sunglasses, or enhancement laser procedures is also included.

LASIK is currently the most popular vision-correcting or "refractive" surgery available. But there are other options as well. We will help you find the ideal solution for your problem and partner with the best surgeon to perform your procedure.

Introduction to LASIK

LASIK is the most commonly performed refractive surgery procedure. You may hear people calling it "LASIX," but the correct name is LASIK, which is short for "laser-assisted in situ keratomileusis."

Why is it so popular? LASIK has advantages over other vision correction procedures, including a relative lack of pain afterward and the fact that good vision usually is achieved by the very next day.

An instrument called a microkeratome is used in LASIK eye surgery to create a thin, circular flap in the cornea. Another, newer way of making the flap is with a laser.

The surgeon folds the hinged flap back out of the way, then removes some corneal tissue underneath using an excimer laser. The excimer laser uses a cool ultraviolet light beam to precisely remove ("ablate") very tiny bits of tissue from the cornea to reshape it.

When the cornea is reshaped in the right way, it works better to focus light into the eye and onto the retina, providing clearer vision than before. The flap is then laid back in place, covering the area where the corneal tissue was removed.

Both nearsighted and farsighted people can benefit from the LASIK procedure. With nearsighted people, the goal is to flatten the too-steep cornea; with farsighted people, a steeper cornea is desired. Excimer lasers also can correct astigmatism by smoothing an irregular cornea into a more normal shape.

Learn more about Vision Surgery including LASIK, PRK, Corneal Transplants and more.

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