Screens are part of how children learn, play, and connect. That is not going to change.
What is changing is how much time kids spend on them.
As a result, childhood myopia, or nearsightedness that begins during childhood, is becoming more common.
A British Journal of Ophthalmology review found that global prevalence rose from 24.3% in 1990 to 35.8% in 2023, while researchers project that more than 740 million children and adolescents could have myopia by 2050.
Screen use is only part of that picture, but longer periods of near work and less time outdoors are both associated with myopia risk.
For parents, the question is not whether to allow screen time. It is how to manage it in a way that protects your child's developing vision.
At Insight Optometry in Halifax, we see how screen habits affect children's comfort, focusing, and vision during routine exams. This guide explains what current research says, what Canadian guidance recommends, and what you can do at home.
How Much Screen Time Is Safe for Kids' Eyes?
There is no single number that works for every child.
For children younger than 2, the Canadian Paediatric Society recommends avoiding screen time apart from video chatting with caring adults. For children ages 2 to 5, routine screen time should generally be about one hour or less per day.
For school-aged children and teens, time still matters, but context matters too. Canadian guidance recommends limiting recreational screen time, setting family-specific boundaries, and making sure screens do not replace sleep, physical activity, outdoor time, schoolwork, or face-to-face relationships.
Screen Time by Age
Use these ranges as a practical starting point, then adjust for your child, the content, and the reason the screen is being used.
| Age Group | Practical Guideline | Source |
|---|---|---|
| Under 2 years | Avoid screen time apart from video chatting with caring adults. | Canadian Pediatric Society (CPS) |
| 2 to 5 years | Keep routine screen time to about 1 hour or less per day. Choose high-quality content and stay involved. | CPS |
| 6 to 12 years | Aim for no more than 2 hours of recreational screen time per day. Protect sleep, activity, outdoor time, and family routines. | CPS / Canadian movement guidance |
| 13 to 17 years | Set individualized limits. Watch whether screens interfere with sleep, school, physical activity, relationships, or mood. | CPS |
Following these guidelines consistently is often the hardest part. Statistics Canada found that 44% of children in the same study cohort followed screen-time guidelines in both 2019 and 2023. Those children were more likely to report better health, fewer headaches, and fewer difficulties falling asleep than children who followed the guidelines in neither year. The goal is not a perfect day. It is a routine your family can repeat most days.
What Screen Time Actually Does to Your Child's Eyes
Digital eye strain, sometimes called computer vision syndrome, can cause tired or irritated eyes, headaches, temporary blurred vision, and difficulty shifting focus after long periods of close work.
The main contributors are sustained near focus, reduced blinking, screen position, glare, and poor posture.
Contrary to a common concern, current evidence does not show that normal screen use permanently damages a child’s eyes. It can still cause temporary strain, dryness, headaches, and blurred vision. Here is what can happen instead.
The Myopia Connection
Screens do not directly burn or damage the eye. The longer-term concern is that heavy screen use often comes with more close work and less time outdoors, two factors associated with childhood myopia.
According to the International Myopia Institute, bright outdoor light may help regulate eye growth through retinal dopamine pathways, although the exact mechanism in children is still being studied. The practical recommendation is clearer: regular outdoor time can help delay the onset of myopia.
Digital Eye Strain
When a child reads, writes, or uses a screen at close range, the eye's focusing system stays engaged. Long stretches without a break can lead to soreness, headaches, temporary blur, or trouble refocusing into the distance.
These symptoms are often temporary and may improve with breaks, better screen positioning, and an appropriate viewing distance. Recurring or persistent symptoms should be assessed during a full eye exam.
Dry Eyes and Reduced Blinking
Blinking often slows during concentrated screen use. This allows the tear film to evaporate more quickly and can cause burning, grittiness, watering, redness, or frequent eye rubbing.
Children may not recognize dryness or eye strain as a problem. If your child frequently rubs their eyes, complains of discomfort, or has recurring redness during screen use, a children's eye exam can help identify the cause.
Signs Your Child's Eyes May Be Struggling
Children may assume that everyone sees the way they do. Watch for changes in behaviour rather than waiting for them to describe a vision problem.
- Squinting at the board, TV, or devices
- Sitting unusually close to screens
- Frequent eye rubbing during or after screen time
- Headaches after homework, reading, or device use
- Red, watery, burning, or irritated eyes
- Blurred vision when looking up from a screen
- Tilting the head or closing one eye to see more clearly
- Difficulty switching focus from near to far
- Avoiding reading or close-up tasks they used to enjoy
The Blue Light Question
Parents often ask, “Can blue light from tablets, phones, and computers damage my child’s eyes?”
Current evidence says no. Normal screen exposure has not been shown to cause permanent eye damage.
In fact, the Canadian Association of Optometrists notes that there is no clinical evidence that low-intensity artificial blue light from screens harms the eye. A Cochrane review found that blue-light filtering lenses may not reduce short-term computer eye strain and found no evidence that they protect the retina. Breaks, proper screen setup, and an eye exam when symptoms persist are more useful first steps.
That does not mean late-night screen use is harmless. The Canadian Association of Optometrists notes that evening screen exposure can suppress melatonin, make it harder to fall asleep, and contribute to daytime fatigue. Screen time can also replace physical activity and other routines that support healthy sleep.
How Outdoor Time Protects Your Child's Vision
One of the strongest practical steps for reducing a child’s risk of developing myopia is regular time outdoors.
The International Myopia Institute recommends encouraging at least two hours outdoors each day to help delay myopia onset. The activity does not need to be organized sports, and children do not need to stare towards the sun. Recess, walking, backyard play, and time outside, even in the shade, all count as outdoor time.
How Much Outdoor Time Is Enough?
Two hours can be built from smaller blocks across the day. School recess, walking to and from school, outdoor breaks, and weekend activities can all contribute.
Halifax winters can make two hours outdoors harder to reach.
Short walks, bundled-up play, outdoor errands, and weekend outings can all help build that time. On days when stepping outside is not wise, avoid long stretches of uninterrupted close work and use frequent distance breaks.
Practical Screen Habits That Protect Kids' Eyes
Small changes work best when they are easy to repeat. Start with the habits that fit your home and build from there.
- 1. Use the 20-20-20. Every 20 minutes, look at something at least 20 feet away for 20 seconds and blink 20 times.
- 2. Set a comfortable viewing distance. A practical guide is about 1 foot for phones, 2 feet for computers, and 10 feet for televisions. Keep computer screens at or slightly below eye level.
- 3. Match the screen to the room. Avoid using a bright screen in a dark room. Reduce glare and adjust brightness so the screen is comfortable, not harsh.
- 4. Stop screens before bedtime. Turn devices off about one hour before bed. Keep phones, tablets, computers, and televisions out of the sleeping area when possible.
- 5. Create screen-free routines. Meals and family time are good places to start. Regular breaks help children move, look farther away, and reset their attention.
- 6. Schedule eye exams at the recommended ages. The Canadian Association of Optometrists recommends a first full exam between 6 and 9 months, at least one exam between ages 2 and 5, and annual exams from ages 6 to 19 for low-risk children without symptoms.
When Screen Time Becomes a Vision Problem
Healthy screen habits can reduce discomfort and support better routines, but they cannot stop progressive myopia on their own. If your child's distance prescription is changing year after year, their optometrist may recommend a myopia-management plan.
Myopia management goes beyond making vision clear with standard glasses or contacts. The goal is to slow the rate of myopia progression and reduce the amount of nearsightedness that develops during childhood.
Myopia Management Options at Insight Optometry
The right option depends on your child's age, prescription, eye health, lifestyle, rate of change, and ability to follow the treatment routine.
| Option | How It Works | May Suit |
|---|---|---|
| Myopia treatment | Specialty spectacle lenses correct vision while helping slow myopia progression. | Children who prefer glasses or are not ready for contact lenses. |
| Soft contact lenses | Daily disposable soft contact lenses designed for myopia management. | Active children and teens who can safely wear and handle daily lenses. |
| Orthokeratology (Ortho-K) | Custom rigid lenses are worn overnight to reshape the cornea temporarily and provide clear daytime vision. | Children who can follow careful nightly hygiene and attend regular follow-ups with caregiver support. |
| Low-dose atropine | Prescription eye drops may be used to help slow progression, sometimes alongside glasses or contacts. | Children whose optometrist determines that atropine fits their treatment plan. |
Insight Optometry offers myopia management in Halifax, including MiYOSMART glasses, MiSight contact lenses, Ortho-K, and low-dose atropine when clinically appropriate. An optometrist can explain the expected benefits, care requirements, costs, and follow-up schedule for each option.
Frequently Asked Questions
Can too much screen time permanently damage my child's eyes?
Research does not show that normal screen use permanently damages the eyes. Long sessions can cause temporary eye strain and dryness. More screen time can also mean more prolonged near work and less time outdoors, habits associated with a higher risk of childhood myopia.
At what age should my child have their first eye exam?
The Canadian Association of Optometrists recommends a first full exam between 6 and 9 months, another exam between ages 2 and 5, and then annual exams from ages 6 to 19 for low-risk children without symptoms. Book sooner whenever you notice a concern.
Does Nova Scotia MSI cover children's eye exams?
Yes. Nova Scotia MSI covers one routine eye exam every two years for children who have not yet reached their 10th birthday and have a valid Nova Scotia health card. Additional services or testing may have separate fees.
Do children need blue-light glasses for screens?
Current evidence does not support blue-light glasses as a reliable way to prevent eye damage or reduce digital eye strain. Regular breaks, correct viewing distance, reduced glare, outdoor time, and a consistent bedtime cutoff are more useful first steps. Review the evidence on blue-light filtering lenses.
When should myopia management be considered?
Myopia management should be discussed when a child is diagnosed with myopia, especially if their prescription is changing quickly or they have other risk factors. The best treatment depends on the child's age, prescription, eye health, routine, and ability to follow care instructions.
Questions about your child's vision?
Our Halifax team is here to help you decide when it's time for an eye exam.
