Children's Myopia Clinic · North Strathfield, Sydney
How Much Hyperopic Reserve Does Your Child Have Left?
Your child reads every line on the eye chart. So how would you know if short-sightedness is already on its way? There is one measurement that answers that — and it changes well before a vision test notices anything.
Hyperopic reserve is the small amount of long-sightedness every child is born with — a built-in buffer that the eye uses up as it grows. When the reserve runs low for a child's age, it is the strongest early warning that short-sightedness (myopia) is on the way — often before anything shows on a vision test.
At Concord Eyecare in North Strathfield, we measure it with cycloplegic refraction — the same method used in China's national screening program — together with axial length.
Find out how much buffer your child has left.
Reviewed by Dr Nikki Peng · Last clinically reviewed August 2026
The buffer, and how childhood spends it
Population averages for children aged 3–16 (Wang et al., British Journal of Ophthalmology, 2024). A reference range — not a prediction for any one child.
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What is hyperopic reserve?
Every child is born with a buffer. Childhood spends it.
Hyperopic reserve is the mild, normal long-sightedness children are born with. It is not a problem to fix — it is a buffer that protects against myopia. As the eye grows longer through childhood, the buffer is gradually spent. When it runs out, myopia begins.
If you first heard this term as 远视储备 from an optometrist or school screening in China, it is the same concept. Chinese health authorities treat reserve monitoring as a national priority.
The same check is available here. It uses the two measurements we already take in every children's myopia assessment: the true prescription and the eye's length.
What does a low reserve mean for my child?
A low reserve is a warning, not a verdict.
A low reserve means your child deserves closer watching — not that myopia is certain. It is a risk marker, not a verdict. Some children with a low reserve hold steady for years; a healthy reserve, on the other hand, is genuinely reassuring.
Reserve effectively gone
40%
became myopic within two years
Ample buffer still in hand
3%
became myopic within two years
Dong W, Fu K, Zhang Y, et al., Frontiers in Public Health 2025 — 24-month prospective cohort, 15,046 primary school children, Xi'an, China. Population figures; results vary.
The research is striking, though. In a two-year study of 15,046 primary school children in Xi'an, China, about 40% of children whose reserve was effectively gone became myopic within two years — against 3% of the children who still had an ample buffer in hand. That is roughly a twelve-fold difference in risk. And because the reserve runs down before vision changes, this kind of warning typically appears one to two years before a vision test picks anything up.
had the expected reserve for their age
How many children still have the expected reserve?
In a 2025 study of 2,109 preschoolers in Beijing, only about one in four children aged 3–6 still had the expected reserve for their age. Modern childhood spends the buffer quickly — which is exactly why China now screens for it from kindergarten.
There is one thing worth doing straight away, whatever the numbers say: time outdoors. Research suggests around two hours a day of outdoor time lowers the risk of myopia starting. It is the everyday habit with the best evidence before myopia begins, and it costs nothing.
How we handle it at Concord Eyecare
A healthy reserve gets reassurance and a date to re-check. A low reserve gets a closer watching schedule, so that if myopia does start, myopia control can begin early — when it does the most good. The watching itself is mostly axial length — quick, no drops, and it shows the direction and speed of change before the prescription moves. This is our own practice pathway; the right interval for your child is your optometrist's call.
Hyperopic reserve check · Sydney
Find out how much buffer your child has left.
How much hyperopia should a child have at each age?
The buffer drains fastest at six — and then it keeps going.
A healthy hyperopic reserve is around +2.00 D at age six, falling to about +1.50 D by eight and +1.00 D by ten. The buffer is spent fastest around age six — about a third of a dioptre per year — which is why early checks matter.
| Age | Typical healthy reserve (average) |
|---|---|
| 3 years | +2.64 D |
| 6 years | +2.08 D |
| 8 years | +1.49 D |
| 10 years | +1.04 D |
| 16 years | −0.35 D On average, the reserve is fully spent. |
Source: normative study of 3,118 Chinese children and adolescents aged 3–16, British Journal of Ophthalmology, 2024 (Wang et al.). Measured under cycloplegic refraction — the standard for reserve measurement.
Spent in a single year, at around age six
That is the fastest the buffer drains at any age — which is why a check before school is worth more than a check after it.
Two numbers on this table are worth pausing on. The reserve drains fastest at around age six — roughly 0.35 D in a single year. And the international research consensus flags a six-year-old whose cycloplegic result is +0.75 D or less (but not yet myopic) as pre-myopic: not short-sighted today, but likely to become so without a change in course.
These are population reference values, not a verdict on any one child. Your optometrist reads them alongside age, family history and axial length — the eye's front-to-back length, which tells us how the growth itself is tracking.
Find out how much buffer your child has left.
Book my child's assessmentHow is hyperopic reserve measured?
The eye chart can't see this. Two measurements can.
A school screening or basic vision test cannot see hyperopic reserve — a child with a shrinking buffer still reads the chart perfectly. Measuring it takes two things: cycloplegic refraction, which reveals the true prescription, and axial length, which tracks the eye's actual growth. Together they show how much buffer remains.
That is the whole point of this check: it looks ahead of the vision chart, not at it.
The true prescription
Eye drops briefly relax the eye's focusing muscles so we can measure the true prescription. Children's focusing is so strong it can hide a shrinking reserve — without the drops, the number simply isn't reliable. Near vision is blurry for a few hours afterwards; that's normal and wears off.
How the eye is growing
The eye's front-to-back length, measured with the IOLMaster in seconds, using light — nothing touches the eye. Myopia is, physically, an eye that has grown too long, so tracking length shows growth directly. Not all optometrists measure it — most practices rely on the glasses prescription alone, which is less sensitive to early change; measuring length takes an optical biometer, and we run one here. More on how axial length measurement works.
Every result goes onto your child's SightTrack chart — a growth chart for your child's eyes. One visit gives a starting point; repeat visits show the direction and speed of change, which is what actually answers the question you came in with.
When should my child have their first check?
Before school if you can. No later than six.
We suggest a first reserve check before school starts — around age four to five — and no later than six, because that is when the reserve drains fastest. Children with a myopic parent are worth checking earlier. This is our practice's guidance, not an official screening rule.
China's national monitoring begins in the final year of kindergarten for the same reason. If your child is already older, the check is still worth doing: the table above runs to sixteen, and knowing where your child sits on it beats guessing.
What it costs — the whole story
$95
Initial SightTrack Myopia Assessment · the only visit that needs the drops
The initial SightTrack Myopia Assessment is $95, and it is the only visit that needs the cycloplegic drops — that visit confirms whether myopia is present and measures the true reserve. After that, keeping watch is simple: reviews are bulk billed for children with a Medicare card (billed straight to Medicare, no out-of-pocket consult fee) plus $45 for the axial length re-measurement, and the drops are not repeated — tracking the eye's length is enough to follow its growth.
Find out how much buffer your child has left.
Book my child's assessmentOr call (02) 8765 9600 · Concord Eyecare, 161 Concord Road, North Strathfield
Hyperopic reserve — questions parents ask
The four we hear first.
Is hyperopic reserve the same as being long-sighted?
No. Hyperopic reserve is the small, normal amount of long-sightedness a child is supposed to have — a buffer, not a condition. Significant long-sightedness that causes eyestrain or affects learning is a different issue, and the same cycloplegic examination picks that up too.
My child sees perfectly — why would we check this?
Because the reserve runs down silently. A child can read every line of the chart while their buffer shrinks year on year; the vision test only fails after the reserve is gone and myopia has begun. Checking the reserve is how you get ahead of that moment instead of reacting to it.
What happens at the appointment?
A comprehensive children's myopia assessment: cycloplegic drops, the true-prescription measurement, IOLMaster axial length (seconds, nothing touches the eye), an eye health check, and a plain-English explanation of where your child sits against the age norms — recorded on their own SightTrack eye-growth chart. Near vision stays blurry for a few hours after the drops, so bring sunglasses or a hat and leave homework for the evening.
What if the reserve turns out to be low?
Then you found out at the best possible time. A low reserve means closer monitoring on a schedule your optometrist sets — and the outdoor-time habit that helps before myopia starts. What the follow-up visits involve, and what they cost, is set out above. If myopia has already begun, we talk through when and how myopia control starts. What a low reserve never means is that nothing can be done.
Can we go through this in Chinese?
Yes. Dr Nikki Peng consults in Mandarin and Cantonese, and there is a Chinese version of this page. Reception and bookings are in English.
More on children's myopia
Where to read next.
Further reading
Children's myopia care across Sydney
Families travel to us from right across Sydney for their child's myopia care.
Concord Eyecare is at 161 Concord Road, North Strathfield — and no referral is needed to book a hyperopic reserve check. Consultations are available in English, Mandarin and Cantonese. Call (02) 8765 9600 if you would rather talk it through first.
Book a children's myopia assessment
Find out how much buffer your child has left.
One visit gives you a starting point — the true prescription, the eye's length, and where your child sits against the age norms, explained in plain English.
Concord Eyecare · 161 Concord Road, North Strathfield NSW 2137 · No referral needed