Author: Dr Val Phua
Estimated reading time: 10–12 minutes
Should Parents Be Worried About Screen Time?
Smartphones, tablets and computers have become an essential part of modern childhood. From school assignments to online learning and entertainment, children are spending more time than ever looking at digital screens.
Many parents ask:
“Is screen time causing my child’s myopia?”
The answer is not as straightforward as many headlines suggest.
Current research indicates that screen time itself is unlikely to be the sole cause of myopia. However, prolonged near work, fewer breaks and reduced outdoor activity—all commonly associated with excessive screen use—appear to contribute to the increasing rates of childhood myopia.
What Is Myopia?
Myopia, or short-sightedness, occurs when the eye grows too long from front to back.
Light focuses in front of the retina instead of directly on it, causing distant objects to appear blurred.
Children with progressing myopia may require stronger glasses each year, and higher degrees of myopia increase the lifetime risk of retinal detachment, glaucoma, cataracts and myopic macular degeneration.
Does Screen Time Cause Myopia?
Current evidence suggests that screen time is one contributing factor within a much larger picture.
Researchers believe several related behaviours are important:
- Prolonged near work
- Few visual breaks
- Short viewing distances
- Reduced outdoor time
- Increased educational demands
Children who spend many hours continuously focusing on nearby objects place sustained demands on the eye’s focusing system.
Importantly, screen time often replaces outdoor play and physical activity—both of which are important for healthy eye development.
Why Are Phones and Tablets Different?
Although books also involve near work, smartphones and tablets often encourage:
- Much shorter viewing distances
- Longer uninterrupted use
- Smaller text
- Greater visual concentration
Many children also hold handheld devices significantly closer to their eyes than books.
This increases accommodative demand and encourages prolonged continuous near focus.
Outdoor Time Matters
One reason excessive screen use may increase myopia risk is that it often replaces time spent outdoors.
Bright natural light helps regulate normal eye growth and remains one of the strongest protective factors against childhood myopia.
Current evidence suggests aiming for around two hours of outdoor activity each day, where practical.
Does Online Learning Increase Risk?
During the COVID-19 pandemic, many countries reported increased rates of myopia progression.
Possible contributing factors included:
- Increased screen use
- Reduced outdoor activity
- Longer periods of continuous near work
Although screen exposure increased during this period, reduced outdoor time was also a major contributing factor.
How Much Screen Time Is Recommended?
There is no single number that is appropriate for every child.
The impact of screen time depends on:
- The child’s age
- Whether the content is educational or recreational
- Whether regular breaks are taken
- What activities screen time replaces
Current recommendations from the American Academy of Pediatrics (AAP) and the World Health Organization (WHO) encourage a balanced approach rather than focusing solely on the number of hours spent using digital devices.
Recommended Recreational Screen Time
| Age | Recommendation |
|---|---|
| Under 18 months | Avoid screen media except for video calls. |
| 18–24 months | If introduced, choose high-quality educational content and watch together with your child. |
| 2–5 years | Aim to limit recreational screen time to around one hour per day of high-quality programming. |
| 6 years and above | There is no universal time limit. Instead, ensure screen use does not interfere with sleep, outdoor activity, physical exercise, schoolwork or family interaction. |
These recommendations refer primarily to recreational screen time. Educational screen use required for school should be balanced with healthy visual habits, regular breaks and adequate outdoor activity.
How Can Parents Reduce the Risk?
Parents do not need to eliminate digital devices completely.
Instead, encourage healthy visual habits.
Follow the 20-20-20 Rule
For older children:
Every 20 minutes:
- Look at something approximately 20 feet (6 metres) away.
- Continue looking for 20 seconds.
Younger children should simply be encouraged to take regular breaks every 30–40 minutes.
Encourage Outdoor Play
Aim for approximately two hours outdoors daily, where practical.
Outdoor activity complements all modern myopia control treatments.
Maintain a Comfortable Viewing Distance
Children should avoid holding phones or tablets too close to their face.
A viewing distance of approximately 30–40 cm is generally recommended for reading and tablet use.
Balance Recreational Screen Time
Educational screen use is often unavoidable.
However, unnecessary recreational screen time should be balanced with:
- Outdoor play
- Physical activity
- Reading
- Family interaction
- Adequate sleep
Ensure Good Lighting
Avoid prolonged screen use in dimly lit rooms.
Good ambient lighting reduces visual discomfort and encourages healthier viewing habits.
What About Blue Light?
Many parents worry that blue light from screens damages children’s eyes.
Current scientific evidence does not support the idea that normal screen-generated blue light causes myopia or permanent retinal damage.
The greater concerns remain prolonged near work, reduced blinking, inadequate visual breaks and reduced outdoor exposure.
Signs Your Child May Be Developing Myopia
Watch for:
- Squinting to see distant objects
- Sitting very close to the television
- Holding books or devices very close
- Complaining of blurred distance vision
- Frequent changes in spectacle prescription
If you notice these signs, arrange a comprehensive eye examination.
Frequently Asked Questions
Should children avoid screens completely?
No.
Digital devices are now an important part of education and everyday life.
The goal is healthy, balanced use rather than complete avoidance.
Is reading safer than using an iPad?
Both involve near work.
The important factors are maintaining a comfortable viewing distance, taking regular breaks and balancing near activities with outdoor time.
How much screen time is too much?
There is no single number that applies to every child.
For preschool children (2–5 years), most professional organisations recommend limiting recreational screen time to around one hour per day of high-quality content.
For older children, the emphasis should be on ensuring that screen use does not replace:
- Adequate sleep
- Outdoor play
- Physical activity
- Family interaction
- Healthy visual habits
Quality of screen use is often more important than the total number of hours.
Can reducing screen time reverse myopia?
No.
Reducing screen time does not reverse existing myopia, but healthy visual habits may help reduce further progression when combined with evidence-based myopia control treatments.
The Bottom Line
Screen time alone is unlikely to explain the rise in childhood myopia, but prolonged near work, fewer visual breaks and reduced outdoor activity all contribute to increasing risk.
Parents should focus on developing healthy digital habits rather than simply counting screen hours. Encourage children to take regular breaks, maintain an appropriate viewing distance, spend around two hours outdoors each day, and balance recreational screen use with physical activity and adequate sleep.
When combined with evidence-based treatments such as low-dose atropine, orthokeratology or defocus spectacle lenses where appropriate, these lifestyle measures can help protect children’s vision and reduce the long-term impact of myopia.
References
- International Myopia Institute. IMI White Papers and Clinical Management Guidelines.
- American Academy of Pediatrics. Media and Young Minds. Pediatrics. 2016.
- American Academy of Pediatrics. Digital Ecosystems, Children and Adolescents. Pediatrics. 2025.
- World Health Organization. Guidelines on Physical Activity, Sedentary Behaviour and Sleep for Children Under 5 Years of Age.
- International Myopia Institute. IMI White Papers on Near Work, Outdoor Time and Myopia.
- American Academy of Ophthalmology. Myopia in Children.
