When Can a Child Stop Ortho-K? Myopia Rebound, Stopping Age and What the Evidence Says

Hello. I’m Dr. Jinhag Baik, an ophthalmologist and head director of nuneHIM Eye Center on Siheung-daero in Guro-gu, Seoul.

Parents whose children have worn orthokeratology (ortho-k) lenses for a few years eventually ask the same thing: How long does this go on? Usually it comes up at a natural break, like a new school year or a lens replacement. The worry behind it is simple: if we stop, will the myopia shoot back up?

The short answer: the right time to stop ortho-k depends on whether your child’s myopia has stopped progressing, not on a particular age or school grade. Stop while the eye is still lengthening, and axial growth can speed up again.

How does ortho-k slow myopia?

Ortho-k lenses are rigid lenses worn overnight. They gently flatten the center of the cornea so a child can see clearly during the day without glasses. They also change how light focuses on the peripheral retina, which is thought to reduce the signal that drives the eye to grow longer.

Myopia progression in children is mostly a matter of axial length, the front-to-back length of the eye. That’s why ortho-k is judged by how much it slows axial growth, not by an eye-chart score.

A 2019 American Academy of Ophthalmology (AAO) evidence review of 13 studies found that ortho-k typically reduced axial elongation by about 50% over two years, roughly 0.3 mm versus 0.6 mm in controls (about 0.5 D of refraction). The effect may be greater when treatment starts at age 6–8. The same review warned that rebound can occur after discontinuation, and that microbial keratitis remains the main safety concern.

What happens when a child stops?

In a 2017 Hong Kong study by Cho and Cheung, children aged 8–14 who had finished a two-year ortho-k trial were split into three groups: 16 continued ortho-k, 15 stopped for 7 months (wearing glasses) and then resumed for 7 months, and 13 wore glasses throughout.

• During the 7 months off ortho-k, axial elongation sped up significantly, to a rate similar to that of the original spectacle wearers.
• After resuming ortho-k, it slowed again to match the children who never stopped.

The authors concluded that stopping ortho-k at age 14 or younger led to faster axial growth. The groups were small, though, and resuming treatment slowed further growth; it didn’t undo the growth that happened during the break.

How big is the rebound?

“Rebound” means faster-than-expected progression after treatment stops, not just a return to the natural rate. For ortho-k, recent systematic reviews don’t fully agree:

Review	What it found for ortho-k
Chiu et al., 2023 (14 studies, 703 participants)	Predominantly strong rebound in the 8 ortho-k studies; rebound diminished the longer treatment had been stopped
Sánchez-Tena et al., 2024 (11 studies)	Optical treatments, including ortho-k, rebounded less than atropine or red-light therapy (mean 0.04 mm)
Bullimore & Brennan, 2025 (19 studies)	Annualized ortho-k rebound of +0.03 to +0.14 mm; no rebound found for myopia-control spectacles or soft lenses

And a 2023 randomized trial of 308 children by Zhu et al. found no noticeable rebound after a one-month break following a year of wear.

Taken together, the evidence suggests that axial growth can pick up again after stopping. How much it does is still unsettled, and it probably depends on age and how long the break lasts.

At what age does myopia usually stop progressing?

On average, in the mid-teens, but the range is wide. The COMET study followed 469 children who were myopic at ages 6–11 for 11 years. Among those with usable data, myopia stabilized at a mean age of 15.6 years (standard deviation 4.2 years), at an average of −4.87 D. In a follow-up analysis, only 59.7% were stable by age 15.

With a standard deviation of more than four years, some children stabilize much earlier and some keep progressing into their twenties. COMET also studied an ethnically diverse U.S. cohort, so the numbers may not translate directly to East Asian children, whose myopia often progresses faster.

What do Korean experts recommend?

The 2025 Korean pediatric myopia management consensus (published in the Korean Journal of Ophthalmology, 2026) is the most relevant guidance for families in Korea. On stopping treatment, it says:

Point	Consensus statement
Official cut-off	No established guideline yet
When to consider stopping	From about age 13–15
Refraction	Myopia increasing by less than 0.25 D per year
Axial length	Eye growing by less than 0.1 mm per year
Individual factors	Current myopia, expected final refraction and rate of progression
Ortho-k specifically	Early discontinuation can cause rebound; long-term wear may help

The consensus also reports that 65.4% of Korean children and adolescents are myopic and 6.9% are highly myopic. For children who start myopia control early, it suggests aiming to keep final myopia below about −5 to −6 D and axial length below 26–26.5 mm.

The age range doesn’t mean “stop at 13.” It means that after that age, if progression has genuinely slowed, stopping is a reasonable discussion.

Does a short break for lens replacement matter?

A little, mainly the first time. Ortho-k lenses are usually replaced every one to two years, and a short pause is sometimes needed in between.

A 2026 Taiwanese study of 126 children found that axial length increased by a mean of 0.039 mm during the first replacement break. That was more than the average monthly growth during wear. In later replacement cycles there was no significant change, and children with longer cumulative wear showed less growth during breaks. Using low-dose (0.01%) atropine during the break made no clear difference.

The practical message is not that breaks are dangerous. It’s that they shouldn’t last longer than necessary, especially early on.

Does ortho-k stop working after a few years?

Not necessarily. In a five-year Japanese study (22 ortho-k vs. 21 spectacle wearers who completed follow-up), total axial growth was 0.99 mm with ortho-k versus 1.41 mm with glasses. The yearly difference was significant in years 1–3 but not in years 4–5. That could mean natural progression simply slowed as the children got older, so it isn’t proof that ortho-k stopped working.

How long until the cornea returns to normal?

Usually within a few weeks, though it varies. A 2025 systematic review of 15 studies found that corneal measurements stabilized 1–2 weeks after stopping ortho-k (median 1.6 weeks). One small study found the corneal curvature still hadn’t fully recovered after one month, while another found that most corneal biomechanical measures had returned to baseline within a month.

Children will need up-to-date glasses during the transition. Adults planning laser vision correction should have repeated corneal measurements until they’re stable before surgery is planned.

When should lenses come out right away?

Regardless of age or progression, remove the lenses and see an ophthalmologist promptly for eye pain, marked redness, light sensitivity, discharge or a sudden drop in vision. Microbial keratitis is the most important complication of ortho-k, and checking for it comes before any myopia-control decision.

How we decide at nuneHIM Eye Center

When families ask about stopping, we compare measurements over time:

1. Axial length: how much the eye has grown over the last 6–12 months. This is the key number.
2. Refraction: if needed, measured after a short lens break so ortho-k doesn’t mask the true prescription.
3. Corneal topography: lens centration, and corneal recovery after stopping.
4. Slit-lamp examination: checking the cornea for scratches or inflammation.
5. Lens check: scratches, warping and case hygiene.

If your child has axial length records from a previous clinic, bringing them helps us calculate the growth rate more accurately.

FAQ

At what age should my child stop ortho-k? There’s no fixed age. The 2025 Korean consensus suggests stopping can be considered from about age 13–15 if myopia increases by less than 0.25 D and the eye grows less than 0.1 mm per year.

Will myopia get much worse if we stop? If the eye is still growing, axial elongation can speed up. Reported ortho-k rebound ranges from about 0.03 to 0.14 mm per year, and the evidence is mixed.

Is a one-week break for new lenses a problem? Usually not, but keep it short. In one study, the first replacement break added a mean of 0.039 mm of axial length, and later breaks made no significant difference.

Does using atropine during the break help? In the 2026 Taiwanese study, 0.01% atropine during short replacement breaks gave no clear additional protection.

Can we restart if myopia speeds up after stopping? Yes. In the Hong Kong study, resuming ortho-k slowed axial growth again, but growth during the break wasn’t reversed.

How long before laser eye surgery should an adult stop ortho-k? Studies suggest the cornea typically stabilizes within 1–2 weeks, but it varies, so surgeons confirm stability with repeated measurements.

A note from Dr. Baik

After years of nightly lenses, it’s natural for families to want an end date. My guiding principle is this: the day to stop ortho-k is set by your child’s eye-growth record, not by the calendar. If growth has really slowed, stopping is a sensible conversation. If the eye is still lengthening, a little more patience usually pays off.

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nuneHIM Eye Center (눈에힘안과의원) Head Director: Jinhag Baik, MD, Ophthalmologist 551 Siheung-daero, Gwanghui Building 5F, Guro-gu, Seoul (near Guro Digital Complex and Gasan Digital Complex) Website: nunehim.com

Written and medically reviewed by Jinhag Baik, MD. Published November 5, 2026.

This article is for general education, based on published research and professional consensus statements as of November 2026. It does not replace an individual eye examination. Decisions about starting or stopping ortho-k should be made with an ophthalmologist.

References

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