Why Does My Child's Prescription Keep Getting Worse Every Year?

You have probably sat through this appointment before. Your child works through the chart, a few lenses get swapped in and out, and then comes the update you were quietly bracing for. It has changed again.

Perhaps this is the third year running. Perhaps the jump was larger this time than last. And somewhere between the front desk and the car park, the same question tends to surface. Where does this actually end?

It is a reasonable question, and it deserves a fuller answer than a reminder to book again in twelve months.

What the prescription is actually measuring

Here is the part that often goes unexplained.

Short-sightedness, or myopia, is usually not a problem with how your child's eye focuses. It is a problem with how long the eye has become.

A healthy eye is roughly spherical, and light entering it lands neatly on the retina at the back. In a short-sighted eye that sphere has stretched slightly from front to back, so light comes into focus just short of the retina and distant objects blur. Glasses correct the blur by shifting the focus back to where it belongs, which is why your child can read the whiteboard again the moment they put them on.

What glasses do not do is stop the stretching. The stretching is what drives the annual increase, and it continues quietly underneath the correction.

This is the source of most of the frustration parents describe to us. The prescription keeps climbing despite the glasses being worn faithfully, and it looks as though the glasses are failing. They are not failing. They were never designed to do that particular job, and for a long time nothing was, which is probably why the explanation was rarely offered.

Why the length of the eye matters

Most parents file myopia alongside braces: an expensive nuisance that resolves once the child stops growing.

The picture is a little different. An eye that has stretched is structurally a thinner eye, and that carries consequences across a lifetime which have nothing to do with reading the whiteboard.

Adults with high myopia, roughly minus six dioptres and beyond, carry meaningfully elevated lifetime risk of retinal detachment, glaucoma, earlier cataract, and myopic macular degeneration. None of these are corrected by a stronger lens. They are structural, and the risk broadly scales with how far the eye stretched during childhood.

That is the real argument for taking this seriously, and it has less to do with lens thickness at eighteen than with the health of the eye at fifty.

It is also why the years between roughly six and sixteen matter so much. That is when most of the stretching happens, and it is the only period in which anyone has meaningful influence over it.

What can change the trajectory

Over the past fifteen years or so, myopia management has moved from research interest to accepted clinical practice. Several approaches now have good evidence behind them for slowing axial elongation, which is the stretching itself, rather than simply correcting the blur that results from it.

They fall broadly into three groups.

Overnight contact lenses, also called orthokeratology. The child sleeps in a rigid lens that gently reshapes the front surface of the eye overnight. The lens comes out on waking and they see clearly through the day with nothing on their eyes at all. Published studies fairly consistently show reductions in axial elongation somewhere in the range of thirty to fifty per cent compared with standard single vision glasses.

Low dose atropine drops. One diluted drop each night. There is no lens to handle and no daytime device, which makes it a sensible option for children who are not yet ready for contact lenses. It slows progression without correcting vision, so glasses are still worn during the day.

Myopia control soft lenses. Daily disposables worn during waking hours, built with an optical profile designed to signal the eye to slow its growth.

None of these reverse myopia, and anyone telling you otherwise is selling something. What they do is alter the slope of the line, and across ten years of childhood a change in slope compounds into a materially different endpoint.

On growing out of it

They will not. This is probably the most expensive misconception in the field.

Myopia that begins in childhood does not resolve with age. It progresses until the eye finishes growing, usually in the late teens or early twenties, and then it stays roughly where it landed. Waiting does not help, and it is not a neutral choice either, because the fastest progression occurs in the youngest children. Two years of waiting spends the most valuable part of the window.

The opposite worry comes up just as often, which is that a child is too young for any of this. In practice the reverse is usually true. Early intervention is where the largest gains sit, and children as young as six manage overnight lenses well with a parent supervising insertion and removal.

On whether it is anyone's fault

Almost every parent asks some version of this, and it is usually about screens.

Genetics does most of the work here. If one parent is short-sighted, the child's risk roughly doubles, and with two it climbs further again. Environment contributes as well, though the most robust finding concerns time spent outdoors rather than screen time specifically. Around two hours a day outside appears protective, and the evidence points to outdoor light itself doing the work rather than any particular activity.

So it is worth encouraging, genuinely. But if your child is already short-sighted, more time outdoors will not undo it, and no amount of screen restriction substitutes for active management. The guilt is neither useful nor warranted.

What a more useful appointment looks like

If the prescription has increased two years in a row, the next review should involve more than a refraction.

Ask about axial length measurement. This is a direct measurement of the eye's length in millimetres, and it is the number that genuinely tracks what is happening. It picks up change earlier than the prescription does, and it is how progression is properly monitored over time. If nobody has measured it, nobody is really following the underlying problem.

You should also expect a projection, meaning some sense of where this trajectory lands by adulthood if nothing changes. And you should be given a clear comparison of the management options as they apply to your child's age, prescription and lifestyle, rather than a single recommendation offered without context.

Where to from here

The frustration of that annual appointment is real, and it comes from a genuine mismatch. You are handed a solution to the blur, when the thing worrying you is the trend.

The trend can be addressed. Not perfectly, and not by reversing anything, but by slowing it measurably during the years in which it can still be slowed.

At Noranda Optometrist we spend a good deal of time on exactly this with children and their parents: measuring axial length properly, mapping out the likely trajectory, and building a management plan that suits the child in front of us. If your child's prescription has moved again this year, that is a conversation worth having.

This article is general information and is not a substitute for an eye examination. Every child's situation differs, so please book a consultation to discuss what is appropriate for yours.