Orthokeratology (also known as OrthoK, OK, corneal reshaping and corneal refractive therapy CRT) involves gently reshaping the cornea to modify or eliminate refractive error. Ortho K is an innovative way of wearing contact lenses – custom hard contact lenses are worn overnight, temporarily altering the shape of the cornea enough to produce clear, lasting vision (after removal of lenses) throughout the day. This procedure is reversible and safe.
Orthokeratology is the nightly use of a small contact lenses (about 1cm in diameter) during sleep to mould the shape of the cornea to reduce or correct myopia.
The cornea (front window of the eye) is highly elastic, and always returns to its original shape. This is why the lenses need to be worn everynight during sleep to maintain the moulding effect once the correct corneal shape has been achieved. This is also why ortho k is considered a reversible process (unlike laser surgery).
Increasing myopia is becoming an epidemic in some Asian countries, where up to 80% of teenagers have this condition. Recent findings on the ability of ortho k wear to slow the progression of myopia (nearsightedness) means that this type of contact lens is a major technique for the control of myopia progression.
Children as young as 8 years old can be successfully fitted. You will be closely monitored during the process.
Orthokeratology is perfectly suited for anybody who wants clear natural vision all day, every day without spectacle wear. It is suitable for all people who:
have mild to moderate myopia (-0.75 to –6.00D), even with astigmatism
are over 40 years who predominantly need reading glasses
are active or those with occupational demands not suited to standard RGP or disposable contact lenses
lose their contacts easily (eg who participate in water or contact sports)
suffer from allergies especially with contact lenses
have considered refractive surgery (eg lasik or laser surgery)but are worried about the risks involved
have difficulty with dry eyes ( from air conditioning, computer use or dusty environments) and cannot use contact lenses during the daytime.
find soft contact lenses do not fulfil the comfort demands their lifestyle places on their eyes
Following a comprehensive assessment, we will be able to tell you if you can have ortho k. The shape and size of your eye will be a significant factor in whether you can be fitted successfully.