Orthokeratology (ortho-k) involves gently reshaping the cornea with custom overnight contact lenses, to temporarily modify or eliminate refractive error (primarily short sightedness). The benefit? Clear unaided vision throughout the day without the risks of refractive surgery.
How does orthokeratology work?
The unique curved design of ortho-k lenses generates pressure in the thin layer of tears under the contact lens. It’s this gentle tear pressure, rather than the lens itself, that is responsible for the subtle change in corneal shape.
Is orthokeratology safe?
Worn while you sleep, ortho-k lenses are made from a highly oxygen permeable (breathable) material enabling treatment to proceed relatively safely during sleep without the problems caused by a lack of oxygen to the cornea.
How often are ortho-k lenses worn?
The cornea is highly elastic and will return to its original shape if orthokeratology lenses are not worn on a regular basis. For this reason, ortho-k lenses are generally worn several times per week, or nightly, to maintain the re-shaping effect once the desired cornea shape has been achieved.
Am I eligible for orthokeratology?
Ortho-k is most commonly used for people who are short-sighted (myopic). It is ideal for sportspeople, swimmers or those who work in dusty or dirty environments. Your optometrist will assess your eligibility based on your prescription and general eye health.