Screen Time and Children's Eyes: A Practical Guide for Parents

Tablets in nursery, laptops for homework, phones for chatting with friends and consoles for weekend gaming: today's children grow up surrounded by screens. Parents often worry about what this means for their children's eyes. Will hours on a tablet make them shortsighted? Is blue light harmful? How much is too much?

There is no need for panic, but there are good reasons for balance. The strongest evidence links long periods of close-up work and too little time outdoors with the development of nearsightedness (myopia), which has become much more common in children worldwide. In this guide we summarise age-based recommendations, explain what research says about screens and myopia, and offer practical family rules and warning signs to watch for.

Age-based screen guidance

The World Health Organization (WHO) and the American Academy of Pediatrics (AAP) have both issued guidance on screen use in young children. Their recommendations are based not only on eyes, but also on sleep, physical activity, language development and family interaction. Many national health services give similar advice.

These numbers mainly apply to leisure screen time. Schoolwork on screens is often unavoidable, which makes breaks, distance and outdoor time even more important.

Near work and myopia: what we know

Myopia occurs when the eyeball grows too long, so distant objects look blurry. It usually develops in childhood and tends to progress until the late teens or early twenties. Higher degrees of myopia increase the risk of serious eye problems later in life, such as retinal detachment and myopic maculopathy.

Research has repeatedly found that children who spend more time on close-up activities, such as reading, homework and screens, are more likely to become myopic. A systematic review and meta-analysis published in 2015 found that more near work was associated with higher odds of myopia. Studies have also suggested that the pattern matters: long, continuous sessions and very short reading distances (closer than about 30 cm) seem to carry more risk than the same total time broken into shorter periods.

Are screens worse than books? The evidence is still developing. Some studies have linked smartphone and computer use with myopia, but they are mostly observational and cannot fully separate screens from other near work or from reduced time outdoors. What is clear is that phones in particular tend to be held very close, and screen use often replaces outdoor play. Our article on why myopia is rising around the world explains the bigger picture.

Outdoor time: the most powerful protective factor

If there is one message for parents, it is this: get your children outside. Numerous studies, including randomised trials in schools in East Asia, have shown that children who spend more time outdoors are less likely to develop myopia. The protective effect appears to come from bright outdoor light, which is many times stronger than indoor lighting even on a cloudy day. One leading hypothesis is that bright light stimulates the release of dopamine in the retina, which in turn slows the elongation of the eye.

Many experts suggest around two hours of outdoor time per day, which can be added up across the day: walking to school, playground breaks, sports, park visits and weekend outings all count. Reading outdoors or playing quietly in the shade still counts; it is the light that matters, not necessarily vigorous exercise. Our article on outdoor time and childhood myopia explores the evidence in depth.

What about blue light and eye strain?

Many parents worry about blue light. There is no evidence that blue light from screens damages children's eyes, and blue-blocking glasses are not recommended for children by major eye care bodies. Children can, however, develop digital eye strain, with tired, dry or sore eyes, headaches and blurry vision after long sessions. These are linked to focusing effort and reduced blinking. Screens in the evening can also delay sleep, which affects mood, learning and overall health.

Practical family rules

Rules work best when they are simple, consistent and followed by adults too. Here are evidence-informed ideas that many families find workable:

1. Outdoors first. Aim for around two hours outside every day, and treat outdoor play as a priority rather than a reward after screens.
2. Break the sessions. Use a timer: every 20 to 30 minutes, children look out of the window or move around for a minute. Our break timer can help. For older children the 20-20-20 rule is easy to learn.
3. Keep a healthy distance. Tablets and books should be held at least about 30 cm away, roughly the distance from fist to elbow. Bigger screens further away, such as a TV across the room, are easier on the eyes than a phone.
4. Good posture and lighting. Sit upright at a table, avoid reading lying down, and make sure the room is well lit without glare.
5. Screen-free zones and times. No screens at meals, in the car for short trips, or in the bedroom at night. Stop screens at least an hour before bed.
6. Plan content together. For young children, choose high-quality programmes and watch together, talking about what you see.
7. Model the behaviour. Children copy adults. Put your own phone away during family time.

Signs of eye problems in children

Children often do not realise that their vision is blurry, because they assume everyone sees the way they do. Parents and teachers are often the first to notice. Watch for:

Some conditions, especially amblyopia (lazy eye), respond best to treatment when detected early, so do not wait for a child to complain. Our guide to eye health in children describes recommended check-ups at different ages.

When screens are needed for school

Homework platforms, online lessons and digital textbooks mean that some screen time is simply not optional. That is fine: the aim is not to eliminate screens but to make their use as eye-friendly as possible. A few adjustments help a lot. Where you have a choice, use a laptop or desktop computer for longer tasks rather than a phone, because larger screens are naturally viewed from further away and text can be made bigger. Increase font size so that your child does not lean in, and check that the top of the screen is roughly at eye level with the child sitting upright at a table.

Encourage children to print long reading assignments occasionally, or to alternate screen tasks with practical ones such as handwriting, drawing or building models. Schedule homework so that it is broken by a snack, a short walk or outdoor play rather than done in one long block. For teenagers who study late, set a firm cut-off time for screens so that homework does not eat into sleep, which is itself important for growing bodies and eyes.

Talk to your child about why these habits matter. Older children are much more likely to take breaks if they understand that their eyes need regular changes of focus and daylight, rather than feeling that the rules are arbitrary. Some families find it helpful to agree a written family media plan that everyone signs, including parents.

Regular eye examinations

Vision screening in infancy and before school entry is recommended by paediatric and eye care organisations in many countries. After that, regular eye examinations are sensible, particularly if a parent is myopic, if the child does a lot of near work, or if any of the signs above appear. An optometrist or paediatric ophthalmologist can check visual acuity, focusing, eye alignment and eye health, often using drops to get an accurate prescription in children.

When to see a doctor

Book an eye examination if your child shows any of the signs listed above, has a family history of significant myopia, squint or childhood eye disease, or has not had a vision check before starting school. Also seek advice if your child complains of headaches, blurred vision or double vision.