How Orthokeratology Works

Often referred to as “ortho-k” or “corneal refractive therapy/CRT”, orthokeratology is an established process of slowly adjusting the shape of the cornea in order to correct a refractive error.

Similar in application to modern contact lenses, orthokeratology allows for all-day vision correction without the need for corrective lenses to be worn.

Reshape Your Vision While You Sleep

Orthokeratology uses specialised gas permeable contact lenses that you wear overnight. The ortho-k lenses reshape the cornea, providing temporary vision correction (correction lasts for between 24 and 48 hours).

Go Lens-Free During the Day!

Because ortho-k lenses are worn overnight, there is no need to wear corrective lenses during the day. Through orthokeratology, people that are unable to wear eyeglasses or contact lenses can enjoy vision correction without corrective lenses or undergoing laser eye surgery.

It Works, Fast!

For most people, orthokeratology will provide a substantial improvement to vision after just a couple of nights of the glasses being worn. However, if you have a higher prescription, full results may take a couple of weeks to present.

Expected Results

We always aim for 20/20 vision when undergoing orthokeratology, though this depends on the individual and their eyes. Generally, 70% of patients will correct to 20/20 or better, and over 90% of patients will see 20/32 or better*.

What to Expect from Orthokeratology

During your appointment with Dr. Fretz she will determine the curvature of your eye using corneal topography. This process is non-invasive and provides us with a detailed map of your cornea.

We then measure your eyes to determine the appropriate lenses to use. Depending on your prescription, there may be multiple sets of lenses that you progress through as you get used to ortho-k. Don’t worry, Dr. Fretz will provide all the information and help you need, including showing you how to insert and remove the lenses.

Most people will experience tangible changes to their vision after two nights of wear, though people with high myopia prescriptions may experience a gradual improvement over the period of several weeks.

There is also substantial evidence that says that orthokeratology can slow or even halt the progression of myopia in children. Research is ongoing, but exciting nonetheless!

Our Services