Is Orthokeratology Safe? Ortho-K Risks & Suitability
Yes — orthokeratology (Ortho-K) is considered a safe, non-surgical way to correct daytime vision and help slow the progression of myopia, provided the lenses are custom-fitted and the eyes are reviewed regularly by a qualified optometrist. Ortho-K uses rigid gas-permeable lenses worn overnight to gently and temporarily reshape the cornea, so that nearsighted vision is clearer during the day without glasses or daytime contacts. As with any contact lens, the main risk is eye infection, and that risk is managed through proper fitting, strict lens hygiene, and scheduled follow-ups.
Ortho-K at EMME Visioncare is led by Jaycob Chin, FIAOMC, Fellowship of the American Academy of Orthokeratology & Myopia Control (AAOMC).
Key takeaways
- Ortho-K is a reversible, non-surgical approach to myopia correction — stop wearing the lenses and the cornea gradually returns to its original shape.
- Published research places the rate of serious infection (microbial keratitis) at a low level, broadly comparable to daily-wear soft contact lenses.
- Safety depends heavily on the fitting optometrist, lens quality, and the wearer’s compliance with hygiene and review appointments.
- A thorough assessment is needed to confirm whether Ortho-K is suitable for you or your child.
How Ortho-K works
Orthokeratology lenses are custom-designed rigid gas-permeable lenses worn only while you sleep. Overnight, they apply gentle, even pressure that flattens the central cornea slightly, changing how light focuses on the retina. The effect is temporary: vision is clear through the day, and the cornea slowly reverts if lens wear stops. For a full overview of how the treatment is planned and carried out, see our main Ortho-K treatment page.
How safe is Ortho-K?
The most serious complication associated with overnight lens wear is microbial keratitis, an infection of the cornea that requires prompt treatment. The good news is that, with modern lenses and proper care, this is uncommon. A 2025 multicentre study of 1,438 Ortho-K wearers in Japan (mean age 12.7 years) reported a microbial keratitis incidence of about 5.4 cases per 10,000 patient-years — a rate the authors found similar to daily-wear soft contact lenses (Hiraoka et al., Japanese Journal of Ophthalmology, 2025).
The figure to take from this is not that Ortho-K is risk-free — no contact lens is — but that the risk is low and largely controllable. Outcomes are closely tied to three things: a precise fit by an experienced optometrist, the wearer following lens-care and wearing instructions, and attending scheduled reviews so any early problem is caught quickly.
Potential risks and how they are managed
Because Ortho-K lenses sit directly on the cornea overnight, good habits matter. The main considerations and how they are addressed:
- Infection risk (microbial keratitis): minimised by thorough cleaning and disinfecting with the prescribed solution, never rinsing lenses in tap water or saliva, and replacing the lens case regularly.
- Corneal staining or discomfort: usually a sign the fit needs adjusting; picked up at review visits and resolved by refining the lens design.
- Handling damage: washing and drying hands before every insertion and removal, and inspecting lenses for chips or debris, prevents most issues.
- Missed warning signs: wearers and parents are briefed to stop lens wear and seek same-day attention for redness, pain, light sensitivity, or blurred vision that does not clear.
Detailed daily and weekly routines are set out in our Ortho-K care and maintenance guide.
Who is a suitable candidate?
Ortho-K is not a one-size-fits-all solution. Suitability is confirmed through a detailed assessment, but typical considerations include:
- Degree of myopia: Ortho-K is most predictable for mild to moderate myopia, broadly up to around −5.00 to −6.00 D with astigmatism up to about −1.75 D. These are guides, not strict cut-offs, and depend on individual corneal measurements.
- Corneal shape: assessed with corneal topography to confirm the cornea will respond well to reshaping.
- Age and myopia progression: children and teenagers are often good candidates, as Ortho-K is one of the established options for helping to slow the progression of childhood myopia. It is also used by adults who prefer not to wear daytime correction.
- Eye health and lifestyle: conditions such as significant dry eye or recurrent infections may affect suitability; active wearers and those in dusty or watery environments often find overnight wear convenient.
- Commitment: consistent nightly wear and disciplined lens hygiene are essential.
If Ortho-K is not the right fit, other myopia-management options can be discussed, including soft myopia-control lenses such as MiSight 1 day and Menicon Bloom. You can compare the full range on our myopia control page.
How we assess Ortho-K safety at EMME Visioncare
Every Ortho-K journey begins with a comprehensive eye examination to check that the eyes are healthy and the prescription is within a workable range. Our optometrists assess the cornea using corneal topography and document eye health with OCT scanning and fundus photography rather than dilating drops, so most patients can be assessed and drive home the same day. Where myopia is progressing rapidly, atropine therapy may be considered and is co-managed with an ophthalmologist. Lenses are then custom-ordered, trialled, and refined over follow-up visits, with regular reviews built into the plan to keep the eyes healthy long-term.
Frequently asked questions
Is Ortho-K safe for children?
Ortho-K is widely used in children and teenagers, partly because younger eyes are where myopia tends to progress. The infection risk is similar to other contact-lens wear, and is managed through careful fitting, good hygiene supervised by parents, and scheduled reviews. A consultation will confirm whether it suits your child.
Can Ortho-K slow myopia progression in children?
Ortho-K is one of the recognised options used to help slow the progression of childhood myopia, alongside myopia-control spectacle lenses, soft myopia-control contact lenses, and atropine. Results vary between individuals, which is why ongoing monitoring is part of the treatment.
What happens if I stop wearing the lenses?
The effect is reversible. Without nightly wear, the cornea gradually returns to its original shape over days to weeks, and your previous prescription returns — nothing about Ortho-K is permanent.
How much does Ortho-K cost?
Fees depend on the lenses and the follow-up care involved. You can read more on our guide to Ortho-K pricing, or ask us during your consultation.
Speak to our optometrists in Singapore
The safest way to find out whether Ortho-K is right for you or your child is a proper assessment. Our optometrists will examine your eyes, take the measurements needed, and talk you through the options — with no obligation to proceed.
EMME Visioncare @ The Cathay (beside Dhoby Ghaut MRT)
2 Handy Road, #02-13 The Cathay Mall
Singapore 229233
Tel: (65) 8690 3598
Email: cathay@emmevisioncare.com
Book an appointment | WhatsApp The Cathay | Getting here & branch details
EMME Visioncare @ HarbourFront (beside VivoCity)
1 Maritime Square, #02-63 HarbourFront Centre
Singapore 099253
Tel: (65) 9383 8569
Email: harbourfront@emmevisioncare.com
Please note: our HarbourFront branch is closing in July 2026.
References & further reading
- Hiraoka T, et al. Incidence of microbial keratitis associated with overnight orthokeratology: a multicenter collaborative study. Japanese Journal of Ophthalmology, 2025.
- American Academy of Ophthalmology — What Is Orthokeratology?