If you have ever watched your child disappear into a tablet and wondered what all those hours are doing to their eyes, you are not alone. It is one of the most common worries parents bring to us.
The reassuring news is that the picture is calmer and more hopeful than the headlines suggest. Here is what the evidence actually shows, and the simple habits that make a real difference.
| Worried about your child’s vision? The simplest next step is an unhurried children’s eye examination, where we can check everything properly and answer your questions in plain English. |
Does screen time actually damage children’s eyes?
This is the question we hear most, so let us answer it honestly. There is currently no good evidence that screens cause lasting damage to a child’s eyes.
What screens can do is make eyes feel tired and uncomfortable after long stretches without a break. That is real, but it is temporary and very manageable.
So the concern is less about permanent harm and more about comfort, daily habits and a couple of things worth keeping an eye on. Let us look at each in turn.
Digital eye strain: real, common and easy to ease
When we focus on a screen up close for a long time, we blink less, and our focusing muscles stay tense. In children, this can show up as:
- Tired, achy or sore eyes
- Headaches, often towards the end of the day
- Blurred vision after a long session
- Rubbing their eyes more than usual
- Dry or gritty eyes
None of this means something is wrong with their eyes. It usually means they simply need more regular breaks. The single most effective habit is the 20-20-20 rule: every 20 minutes, look at something around 20 feet away for about 20 seconds.
If the symptoms continue even with breaks, it is worth booking a check. Tired eyes can sometimes mask a prescription that has gone unnoticed. Our guide to spotting vision problems early runs through the signs worth watching.
The screens and short-sightedness question
Short-sightedness, or myopia, is rising in children across the world, and it is natural to assume screens are to blame. The honest answer is more nuanced.
The trend is real. Nearly one in five UK teenagers is now short-sighted, more than double the rate of fifty years ago. And it matters beyond needing stronger lenses. Higher levels of short-sightedness carry a greater lifetime risk of serious eye conditions, including retinal detachment and glaucoma. That is the real reason slowing its progression in childhood is worth the effort, and why we take it seriously rather than simply updating a prescription each year.
The strongest evidence points to time spent outdoors as the biggest protective factor. Children who spend more time outside are less likely to become short-sighted, and it may help slow progression in those who already are.
Near work, including reading and screens, may play a part, but the evidence there is not strong. In other words, what matters most may not be the screen itself, but the outdoor time that screens tend to replace.
The practical takeaway is reassuring. You do not need to ban devices. You do need to protect daily outdoor time, ideally a couple of hours, and balance near work with regular breaks.
| If your child is already short-sighted, this is where we can genuinely help. We are a MiYOSMART lens and MiSight contact lens specialist, offering proven myopia management designed to slow how quickly short-sightedness progresses. If short-sightedness runs in your family, an early conversation is well worth having. |
What about blue light?
You will have seen blue light glasses marketed heavily for children, often with strong claims. We would rather be straight with you.
There is no reliable evidence that the blue light from everyday screens damages children’s eyes, and no good evidence that blue light filtering lenses prevent eye strain or protect long-term eye health.
Where blue light does have a clearer role is in sleep. Bright screens late in the evening can make it harder to wind down, so a screen curfew before bed tends to do more good than a special lens. If you would like to go deeper, our guide to digital eye strain covers the topic in full.
We will never sell you something your child does not need. If blue light lenses are not the right call, we will tell you.
Which ages need the most attention?
Eye development happens fastest in the early years, so good habits matter from the start. As children move through primary school and into their teens, screen use usually climbs alongside homework and social life, so this is a sensible window to stay attentive.
That said, the most important factor is not age but whether your child has regular eye examinations. Short-sightedness often appears and progresses during the school years, and it can develop quietly. A child rarely complains that the board looks blurry, because they assume everyone sees the world the way they do. Our children’s eye health guide explains how vision develops and what to look out for at each stage.
Simple habits that genuinely help
You do not need to overhaul family life. A few small routines do most of the work:
- Protect outdoor time. Aim for a couple of hours of daylight and outdoor play each day.
- Use the 20-20-20 rule. A short distance break every 20 minutes during homework and screen time.
- Mind the distance. Hold tablets and laptops at roughly an arm’s length.
- Light the room well. Good lighting reduces glare and squinting.
- Wind down before bed. Easing off screens in the evening protects sleep.
- Book regular eye examinations, even when all seems well.
How we help at Perspective
Children are not just small adults, and their eye tests should not be rushed.
At our Belsize Park practice, children’s examinations are unhurried and friendly, carried out by optometrists with specialist paediatric training. We explain everything as we go, to you and to your child, so the whole visit feels calm rather than clinical.
If glasses are needed, we have a handpicked range of children’s frames chosen to be tough, comfortable and genuinely liked by the children who wear them. If myopia management is the right path, we will talk you through MiYOSMART lenses and MiSight contact lenses and help you choose with confidence.
Not sure what a visit involves? Our guide to what to expect in a children’s eye exam walks you through it, and our how to prepare for your eye examination checklist helps the day run smoothly.
Frequently asked questions
Is screen time bad for my child’s eyes?
There is no good evidence that screens cause lasting damage to children’s eyes. They can cause temporary tiredness and strain, which regular breaks and the 20-20-20 rule ease easily. The bigger picture is about balancing screens with plenty of outdoor time.
Can too much screen time cause short-sightedness?
Screens may play a small part, but the evidence is not strong. The clearest finding is that time spent outdoors helps protect against short-sightedness, so the indoor lifestyle that screens encourage may matter more than the screen itself.
Do children need blue light glasses?
For most children, no. There is no reliable evidence that blue light from screens harms the eyes or that blue light lenses prevent strain. If your child struggles with sleep, reducing screens before bed is more effective.
How often should my child have an eye test?
Around every two years is typical, or sooner if you notice symptoms or your optometrist advises it. Short-sightedness can progress quickly during the school years, so regular checks matter even when nothing seems wrong.
At what age should my child have their first eye test?
Most professional bodies suggest a first check by around the age of two, and earlier if you have any concerns. Eyes can be tested before a child can read, so there is no need to wait for them to know their letters.
What are the signs my child might need glasses?
Watch for sitting very close to the screen or television, holding books close, frequent headaches, eye rubbing, squinting, or a turning eye. If you notice any of these, book a check.
When to book
If your child is showing signs of eye strain, struggling to see clearly, or simply due to a check, we are here to help.
| Book a children’s eye examination at our Belsize Park practice and give their vision the careful, unhurried attention it deserves. Or call us on 020 7586 5508. |
