What orthokeratology does, who it suits, the real risks, how it compares with soft multifocal lenses, myopia-control glasses and atropine, and which Hamilton practices offer it.
Ortho-k (orthokeratology, "night lenses") uses a rigid, gas-permeable contact lens worn overnight to gently reshape the front surface of the eye. You take the lenses out in the morning and see clearly all day without glasses or contact lenses. The effect is temporary — stop wearing the lenses and the cornea returns to its original shape within days — which is both the main limitation and the main safety feature. Lenses are custom-designed from a corneal map (topography) of each eye.
Overnight contact lens wear of any kind carries a small risk of corneal infection, and the serious ones (microbial keratitis) are rare but sight-threatening. The risk is driven overwhelmingly by hygiene: tap water, poor hand washing, old cases and missed reviews. Fitted well and worn carefully, ortho-k's safety record in children is good, but it is a medical device that needs regular review (typically every six months), not a set-and-forget purchase.
Ortho-k is one of several evidence-based approaches, and a good practice will tell you which fits your child rather than selling the one it has:
How many children does the practice currently have in ortho-k? Does it measure axial length (eye length), the most reliable way to track whether myopia control is working? What is included in the fee — lenses, fitting visits, the first year of reviews, replacement if a lens is lost? What happens if the fit does not work? Specialty fees vary; Rose Optometry publishes an ortho-k consultation fee of $129 and offers a free 15-minute chat before you commit; Rototuna Optometrists' Myopia Clinic offers ortho-k alongside the soft lens, spectacle and atropine options; Paterson Burn and Gates also list ortho-k.
A practice is included when its own website lists this service; it is not a rating. Ask the practice how often it provides the service and who will see you.
Frankton · Independent
Practices price the full fitting (lenses, fitting visits and initial reviews) as a package and quote it at the consultation; ongoing costs are lower once the fit is stable. Rose Optometry publishes an ortho-k consultation fee of $129 and offers a free preliminary chat.
Yes. Across multiple trials, ortho-k slows the increase in eye length by roughly 40–50 per cent compared with ordinary glasses over two years. Results vary between children, which is why progression should be measured, not assumed.
The main risk is infection from poor hygiene, as with any overnight contact lens. With correct cleaning, no tap water, and regular reviews the rate of serious infection is low. Children usually need a parent to supervise insertion and cleaning at first.
Most people see a large improvement after the first night and full effect within one to two weeks. Vision early on may fluctuate slightly during the day until the cornea stabilises.
Yes, for low to moderate short-sightedness, and it is popular with people who cannot wear daytime contact lenses comfortably. The correction wears off once you stop, which makes it a reversible alternative to laser surgery.
Rose Optometry offers a free 15-minute ortho-k chat and a free myopia chat for parents. Rototuna Optometrists' Myopia Clinic covers all four options.