Also known as orthoK, overnight vision correction (OVC) or corneal reshaping, this technology involves the use of custom-fitted rigid contact lens retainers to mould the eye during sleep.
Most of the focussing power of the eye is provided by the very front surface of the eye, which is called the cornea. Very small changes in the curvature of the cornea can have a profound influence on the refractive power of the eye and therefore to the clarity of sight.
This is how overnight wear of orthoK lenses can improve your vision.
The cornea is gently and safely reshaped while you sleep so that when the retainer is removed in the morning the eyes are able to focus without the need for glasses or daytime contact lenses.
Recent research has proven that orthokeratology lenses inhibits the development of myopia in children as they move through their tween years and teenage.
In previous times, when little was known about the development of short-sightedness, a child would often get glasses at an early age and then need stronger and stronger glasses in the years leading up to adulthood. It now seems that the reason for this is that the glasses provide a clear central image on the macula but not on the peripheral retina and that this “peripheral defocus” is responsible for abnormal growth of the eye.
This lengthening of the eye leads to higher myopia.