“My child's eyes are getting worse.” You may notice squinting, trouble seeing the board at school, or another change in their glasses. It is worth finding out why.
An eye exam is the next step. If your child has myopia, or nearsightedness, eye growth can make things far away look more blurry. But not every change in sight is myopia. The doctor can check the cause and whether the glasses need to change.
Do not wait for a routine visit if the change is sudden. Seek urgent eye care for sudden loss of sight. New flashes of light, lots of new floating spots, or a dark curtain or shadow also need care right away. Go to an eye doctor or an emergency room; do not use an online screening for these symptoms. National Eye Institute: Retinal Detachment
Read the animation’s visual description
- An eye diagram shows light focusing in front of the retina in myopia. The retina is identified as the light-sensing layer at the back of the eye.
- A glasses lens is added in front of the eye. It redirects the light so the focus reaches the retina, bringing distance vision into focus.
- The eye grows longer while the glasses stay the same. The retina moves behind the focus again, showing why the same glasses may no longer be enough.
- The final screen explains that glasses help a child see clearly, while myopia control may help slow myopia progression. It advises asking an eye doctor about both and notes that no treatment can guarantee a prescription will stop changing.
The diagrams are simplified and not to scale. This animation has no audio.
Does worsening eyesight always mean myopia?
No. Myopia makes far-away things look blurry. Other focus problems can blur near or far vision, too. These include farsightedness and astigmatism, which means light does not focus evenly in the eye. An eye exam can tell them apart and check eye health. National Eye Institute: Refractive Errors
Tell the eye doctor when you first noticed the change, whether it affects one or both eyes, and if it happens with glasses on. Bring the current glasses and any past prescriptions. If your child already has myopia, ask about both clear sight now and ways to slow further change.
Why does my child keep needing stronger glasses?
New glasses help your child see clearly. Then, at the next eye visit, they may need stronger lenses again. With myopia, this can happen as the eye grows longer. It does not mean you or your child did something wrong. Here is what eye growth means and what to ask at the next visit.
Growing children, changing eyes
The retina is the layer at the back of the eye that senses light. To see clearly, light must focus on it. With myopia, light focuses in front of it instead. Often, the eye has grown too long from front to back. The shape of the eye’s clear front surface or lens can play a role, too.
Myopia often starts in childhood and may get worse as children grow. It can run in families. A changing prescription is not a reason to blame yourself or your child. National Eye Institute: Nearsightedness
Are the glasses making things worse?
Glasses help bring the image into focus. Needing a stronger pair does not mean the old glasses made your child’s eyes depend on them.
Have your child wear the glasses their eye doctor recommends. Weaker glasses are not a proven way to slow myopia and may make it worse. Do not change the plan or have your child go without glasses on your own. International Myopia Institute: Clinical Management Guidelines (2019)
Can we do more than update the prescription?
No treatment can guarantee that a child's prescription will stop changing. Doctor-directed myopia control may help slow myopia progression in appropriate children.
Ask your eye doctor about myopia control. This means care that may help slow how quickly myopia gets worse. Helping your child see clearly today is one goal. Helping slow further change is another.
Lens-based options include special glasses or contact lenses for myopia control. One contact-lens option is Ortho-K, short for orthokeratology. Research supports several types of care, but children respond in different ways. A child may still need prescription changes during treatment. International Myopia Institute: Myopia-Control Interventions
Where sleepSEE fits
sleepSEE is a doctor-directed myopia control program with overnight Ortho-K lenses at its core. It starts with an eye exam to find out whether this care is right for your child. Learn how sleepSEE works for children.
Ortho-K lenses are fitted to your child’s eyes and worn during sleep. They change the shape of the eye’s front surface for a short time. For children who are a good fit, this can mean clearer daytime vision. Ortho-K can also help slow myopia’s progress. It does not shorten the eye or cure myopia.
Contact lenses have risks, including eye infection. Your child must follow the lens-care steps and return for eye checks. The doctor will explain these steps and help you decide whether your child is ready. International Myopia Institute: Clinical Management Guidelines (2019)
Why measure eye length if my child can see clearly?
Seeing clearly does not tell the whole story. Ortho-K can help your child see clearly, but their eyes may still grow. The doctor measures eye length over time to help check for changes.
Eye-length checks are part of the sleepSEE children’s program. Ask your provider: “How is my child seeing—and how is each eye growing?”
Want more detail? How we measure eye growth
How is eye length measured?
Eye length, also called axial length, is the distance from the front of the eye to the retina at the back. An optical measuring device uses light to check this distance without touching the eye. The doctor compares repeat measurements over time. These checks add information to the eye exam; they do not replace it. International Myopia Institute: Instrumentation for Myopia Management (2025)
What does a change in millimeters mean?
The meaning depends on your child’s age, past measurements, and the time between visits. One number cannot tell you whether treatment is working.
For context, the 2019 IMI guidelines describe about 0.1 millimeter per year as associated with normal eye growth, and 0.2–0.3 millimeter per year as associated with increasing myopia. The report also says there is no single cutoff that defines normal or fast growth for every child. Younger children’s eyes tend to grow faster. These figures are broad research guideposts, not a personal target or a promised sleepSEE result. International Myopia Institute: Clinical Management Guidelines (2019)
Ask your provider to explain the trend for each eye, how it compares with growth expected at your child’s age, and whether the care plan needs to change. Age-based growth charts can help with that discussion. International Myopia Institute: Instrumentation for Myopia Management (2025)
What can we do at home?
Make time for your child to play outdoors, with sun protection. Outdoor time can help delay the start of myopia. There is less clear evidence that it slows myopia once a child already has it. Keep outdoor time part of your routine, along with the care your eye doctor advises. International Myopia Institute: Light and Myopia
For breaks from close-up work, sleepSEE recommends this routine: After 30 minutes of reading, homework, screen time, or other close-up work, have your child take a 3–5-minute break. During the break, have them look at something at least 20 feet away. Then they can return to the task and repeat the routine. These breaks do not replace myopia control care.
For more detail, read our guide to myopia control options and how eye-length checks track myopia.
Three questions for the next eye visit
Bring past prescriptions if you have them, and ask:
- Is my child’s myopia getting worse? How much has changed?
- Should we measure eye length to track changes?
- Which myopia control options fit my child? How will we know if they help?
These questions can help you and the doctor make a plan. Past prescriptions and eye-length checks, when available, can help show changes over time. International Myopia Institute: Clinical Management Guidelines (2019)
sleepSEE Editorial Team
Parent education from sleepSEE. Our guides explain myopia control and questions to discuss with your child’s eye doctor.
Medical Disclaimer
This article helps you learn about eye care. It is not personal medical advice, a diagnosis or a treatment plan. Ask a qualified eye doctor about your eyes and care. Do not use this page in place of that advice.
