how does orthokeratology work?

This is how orthokeratology works

An eye examination is the first step

The first step in orthokeratology is a doctor's eye examinationAn eye doctor needs to examine your eyes to determine whether you have any eye conditions, diseases or any peculiar anatomical features that would prevent you from benefiting from orthokeratology. The eye doctor also needs to determine if orthokeratology is right for you given the type and current level of your prescription. Click here to learn who is not a good candidate for orthokeratology.

The eye doctor takes exact measurements of your cornea

The doctor takes acurate measuremeents of the surface of your corneaIn a painless, noninvasive procedure, the doctor then takes computerized measurements of your cornea - the outside covering of your eye. The resulting images, which are accurate to a fraction of a micron, are called corneal topographies. The corneal topographies are used to create a retainer contact lens that is a mirror image or reverse mold of your cornea. The lens is modified so that when worn, it reshapes your cornea in precisely the correct way to correct your vision problem. So far, orthokeratology is best for nearsightedness and astigmatism. Retainer lens designs for farsightedness are still in development.

Your night time lenses are made form the corneal topography

corneal topographies are used to make your orthokeratology lens retainersThe lens retainers that are made from the topographies are very comfortable and are designed to be worn while you sleep. They are rigid, gas-permeable contact lenses designed just for your eyes and designed to re-shape your cornea while you sleep. Orthokeratology retainters allow oxygen to reach yoru cornea and allow carbon dioxide to escape ensuring optimal eye health.

The concept is similar to a retainer worn in the mouth while sleeping to change the position of your teeth - only in this case it is the cornea of the eye that is changing shape. When you remove the lenses in the morning, you will awaken to perfect, clear 20-20 vision!

The lenses are designed to change the shape of your cornea while you sleep

Orthokeratology retainer lenses change the shape of your cornea to allow it to bend light at the correct angles that are need to produce perfect vision. Depending on the patient, the lenses will need to be worn, every night, every two or three nights or, in less frequent cases, even as little as once a week. At the bare minimum, the patient will have clear vision during the day with none of the inconvenience and hassle of glasses or contact lenses.

Is the effect of Orthokeratology permanent?

The effect remains as long as the overnight lenses are used. If the overnight lenses are not used, then the patient's vision will return to the precorrected state.


focus on the cornea

Focus on: the Cornea

Orthokeratology is concerned with the cornea of the eye. The cornea is the clear part of the eye that covers the pupil. The cornea is critical in maintaining a sharp focus on objects by bending light that enters the eye. Changes in the shape of the cornea can cause blurred vision.

The inside layer of cornea, the endothelium, has a finite number of cells that maintain clarity - these cells do not regenerate. The epithelium, the outside layer of the cornea, has cells that re-generate every 5-7 days - just like the skin.