Your eye number increased because you use your phone too much.
Parents say it. Teachers say it. And if your glasses prescription changes every year, you may start wondering whether your smartphone is really responsible.
So, can too much phone use make your eye number increase?
The answer is more nuanced than simply blaming the phone.
In children and teenagers, long periods of screen use are associated with a higher likelihood of myopia, or short-sightedness, especially when screen time means many hours of close-up work and replaces outdoor time.
A large 2025 systematic review and meta-analysis involving more than 335,000 participants found that each additional hour of daily digital screen time was associated with higher odds of myopia. However, this type of research shows an association; it does not mean every extra hour on a phone directly causes a predictable increase in glasses power.
The real issue involves a combination of near work, genetics, outdoor time and eye growth.
First, What Does “Eye Number” Actually Mean?
When people say their “eye number” has increased, they usually mean their glasses prescription has changed.
One common reason in children and teenagers is myopia.
In myopia:
- Distant objects look blurry
- Near objects may remain clear
- Minus-powered glasses are usually needed
- The eye is often longer from front to back than ideal
As a child grows, myopia can progress and the minus prescription may gradually become stronger.
Does Using a Phone Directly Increase Eye Power?
Not in the simple way many people imagine.
Your phone does not send out something that automatically adds “minus power” to your eyes.
The concern is more about how phones are used.
Using a phone usually involves:
- Holding something close to the eyes
- Focusing at near distance for long periods
- Fewer breaks
- Less time looking into the distance
- Often less time spent outdoors
These behaviours overlap with environmental factors associated with myopia.
The American Academy of Ophthalmology’s EyeWiki describes myopia as a multifactorial condition influenced by both genetic and environmental factors, with near work among the environmental factors studied.
What Does Research Say About Screen Time and Myopia?
Recent evidence strengthens the association between digital screen time and myopia.
A 2025 JAMA Network Open systematic review and dose-response meta-analysis evaluated 45 studies involving 335,524 participants.
Researchers found that each additional hour of daily digital screen use was associated with about 21% higher odds of myopia in the pooled analysis. The association increased most noticeably between approximately one and four hours of daily exposure.
This does not prove that adding one hour of phone use will make every child’s prescription worse by a certain amount.
Myopia is influenced by many factors, and most studies in this area are observational.
But the findings are strong enough that prolonged screen use should not simply be ignored.
Is It the Screen or the Near Work?
Probably both screen habits and the broader pattern of near work matter.
Think about the difference between:
Watching something on a television across the room
and
Holding a smartphone 20–25 cm from your face for three hours.
Both involve screens, but the visual demand is very different.
Smartphones usually encourage sustained close focusing.
Other near activities include:
- Reading books
- Doing homework
- Drawing
- Studying
- Tablet use
- Gaming on handheld devices
So the concern is not that smartphones are uniquely poisonous to the eyes.
It is that they can create hours of uninterrupted near work.
Why Are Children More Important in This Discussion?
A child’s eye is still growing.
Myopia commonly develops and progresses during childhood and adolescence.
If myopia begins earlier, the child has more years during which it may progress.
That is why parents should pay attention when a child starts:
- Sitting closer to the television
- Squinting at distant objects
- Struggling to read the classroom board
- Holding screens unusually close
- Complaining of blurry distance vision
- Needing frequent prescription changes
An eye examination is more useful than simply telling the child to stop using the phone.
Does Phone Use Cause Myopia in Adults Too?
The strongest concern is generally around children and adolescents because their eyes are still developing.
Adults can certainly experience problems from prolonged phone use, including:
- Digital eye strain
- Dry eyes
- Headaches
- Temporary blurred vision
- Difficulty refocusing
- Neck and shoulder discomfort
But temporary blurry vision after hours on your phone does not automatically mean your permanent glasses number has increased.
If blur continues after resting, however, your prescription should be checked.
Why Does Outdoor Time Matter So Much?
Outdoor time is one of the most consistent lifestyle factors associated with lower myopia risk in children.
The World Health Organization recommends strategies that may help delay myopia onset and progression, including at least 90 minutes outdoors in daylight, regular breaks during near work and consistent use of prescribed optical correction.
WHO also identifies prolonged near activities, including smartphone use, and insufficient outdoor time as myopia risk factors in children.
So instead of focusing only on:
“How many hours is my child using the phone?”
also ask:
“How much time is my child spending outdoors?”
Phone Time vs Outdoor Time
A child who spends several hours after school:
Phone → tablet → homework → TV → phone
may have very little opportunity to spend time outdoors.
The issue is therefore not only reducing screens.
It is replacing some indoor near-work time with outdoor daylight activity.
Walking, cycling, playing cricket, football or simply spending time outside can all increase outdoor exposure.
Can Too Much Studying Also Increase Myopia Risk?
Possibly.
Phones get most of the blame because they are everywhere, but prolonged near work is not limited to digital devices.
A child who spends hours reading books very closely without breaks is also performing sustained near work.
This is why healthy eye habits should apply to:
- Phones
- Tablets
- Books
- Homework
- Laptops
- Gaming devices
Not only smartphones.
Does Holding the Phone Too Close Matter?
Very close viewing increases the visual demand required for near focus.
Children sometimes gradually bring a phone closer to their face without noticing.
Encourage them to maintain a comfortable viewing distance rather than placing the screen only a few centimetres from the eyes.
Very close phone viewing can also be a clue that a child already has an uncorrected vision problem.
What About Watching Reels for Hours?
The content itself—Reels, Shorts, games or YouTube—is not what determines myopia.
The issue is the behaviour around it:
- Long uninterrupted sessions
- Close viewing distance
- Few breaks
- Reduced outdoor activity
So watching 200 Reels does not magically change your glasses number.
But spending several hours every day staring at a close smartphone screen may contribute to a lifestyle associated with higher myopia risk.
Does Screen Time Make Existing Myopia Progress Faster?
Research continues to investigate this question.
A 2026 systematic review of European children found an overall association between screen-related behaviours, prolonged near work, reduced outdoor exposure and myopia-related outcomes. However, the researchers emphasized that the available evidence was heterogeneous and mostly observational, meaning causation remains difficult to prove precisely.
This is why it is more accurate to say:
Excessive screen and near-work habits may contribute to myopia risk and progression, rather than saying the phone alone causes increasing eye power.
How Can You Reduce the Risk?
You do not need to throw away every smartphone in the house.
The goal is healthier visual behaviour.
1. Take Regular Near-Work Breaks
Avoid continuous phone, study or tablet sessions.
Give the eyes regular opportunities to look into the distance.
2. Follow the 20-20-20 Rule
After approximately every 20 minutes of screen or near work:
Look at something around 20 feet away for at least 20 seconds.
WHO includes this rule in its eye-health messaging for children to reduce eye strain during near activities.
3. Encourage Outdoor Time
For children, aim for at least 90 minutes of outdoor daylight exposure per day where practical.
Outdoor time is one of the most useful lifestyle habits associated with reducing myopia risk.
4. Avoid Holding the Phone Extremely Close
Encourage a comfortable viewing distance.
If a child constantly brings screens or books very close, arrange an eye examination.
5. Increase Font Size
If text is too small, increase the font rather than moving the device closer to the face.
6. Use Screens in Good Lighting
Do not encourage children to use a bright phone in a completely dark room for hours.
Comfortable surrounding lighting reduces visual discomfort.
7. Encourage Real Breaks
Switching from homework on a laptop to gaming on a phone is not much of a visual break.
The eyes need time away from close-up tasks.
8. Keep Screens Out of Some Activities
Meals, outdoor play and some family time can remain screen-free.
This naturally reduces prolonged near work without turning screen limits into a constant argument.
9. Schedule Regular Eye Exams
A child may not realise their distance vision is becoming blurry.
Regular eye checks can detect:
- New myopia
- Prescription changes
- Astigmatism
- Focusing problems
- Eye alignment issues
- Other eye conditions
What If My Child’s Eye Number Keeps Increasing?
Do not simply keep changing the glasses every year without discussing the pattern with an eye-care professional.
For some children with progressive myopia, specific myopia-control strategies may be considered.
Depending on the child’s age, prescription, eye measurements and individual situation, an eye-care professional may discuss special optical or other myopia-management approaches.
These should be prescribed and monitored professionally rather than selected from online advice.
Does Wearing Glasses Make Eye Number Increase Faster?
No.
Children should not avoid prescribed glasses because of the myth that wearing glasses makes the eyes “dependent” on them.
WHO specifically includes consistent use of prescribed eyeglasses or other optical interventions among appropriate strategies for children with refractive error and myopia.
If the number changes, it is usually because the underlying refractive condition has changed—not because the child wore the glasses.
Can Eye Exercises Reduce the Glasses Number?
There is no simple eye exercise that reliably reverses true myopia caused by the eye’s optical structure or axial growth.
Eye exercises may sometimes be recommended for specific binocular or focusing disorders, but they should not be advertised as a way to erase a myopic prescription.
If a child’s number is increasing, proper evaluation is more useful than relying on viral “remove glasses naturally” exercises.
Signs Your Child May Need an Eye Check
Book an eye examination if your child:
- Squints to see the board
- Moves closer to the television
- Holds the phone extremely close
- Complains of blurry distance vision
- Frequently rubs the eyes
- Gets repeated headaches during study
- Has trouble seeing road signs or distant objects
- Has a rapidly changing glasses prescription
- Has parents with significant myopia
Family history matters because genetics also contributes to myopia risk.
Can You Completely Prevent Myopia?
Not always.
Myopia is influenced by both genetic and environmental factors.
A child can follow excellent screen habits and still develop myopia, particularly if there is a strong family history.
Likewise, one child may spend considerable time on screens without developing a significant prescription.
Healthy habits are about reducing modifiable risk, not guaranteeing that a child’s eye number will never change.
So, Can Too Much Phone Use Make Your Eye Number Increase?
The best answer is:
Too much phone use may contribute to a pattern associated with a higher risk of myopia, particularly in children and teenagers—but the phone itself is not the only cause.
Research increasingly links greater digital screen time with higher odds of myopia.
But eye number is also influenced by:
- Genetics
- Age
- Eye growth
- Total near work
- Outdoor exposure
- Existing myopia
So instead of simply saying:
“Stop using your phone or your eye number will increase.”
a better approach is:
Reduce uninterrupted near work, take regular breaks, spend more time outdoors and get regular eye examinations.
That is a more practical and evidence-based way to protect growing eyes.
Is Your Child’s Eye Number Increasing Every Year?
If your child is struggling to see the board, sitting closer to screens or needing frequent prescription changes, an eye examination can determine whether myopia is progressing and whether additional management is needed.
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Frequently Asked Questions
Can too much phone use increase eye number?
Long periods of digital screen use are associated with higher odds of myopia, particularly in children. However, phone use is only one factor; genetics, near work and outdoor time also matter.
Does screen time cause myopia?
Research shows an association between higher digital screen time and myopia, but myopia is multifactorial and observational studies cannot prove that screens alone cause it.
Can mobile phones make children’s eyesight worse?
Excessive smartphone use may contribute to prolonged near work and reduced outdoor time, both of which are relevant to childhood myopia risk.
How much outdoor time is good for children’s eyes?
WHO recommends at least 90 minutes outdoors in daylight as one strategy that may help delay the onset and progression of myopia in children.
Does the 20-20-20 rule stop myopia?
The 20-20-20 rule is useful for breaking up prolonged near work and reducing eye strain, but it cannot guarantee that myopia will not develop or progress.
Does wearing glasses increase eye power?
No. Wearing the correctly prescribed glasses does not cause the eye number to increase.
Why does my child’s eye number increase every year?
Childhood myopia can progress as the eye grows. Genetics, age, near-work patterns and outdoor exposure can all influence risk.
Can reducing phone use reverse myopia?
Reducing screen time does not normally reverse established myopia. However, healthier near-work habits and increased outdoor time may help reduce modifiable risk, especially in children.
Should my child get an eye test if they use a phone a lot?
Regular eye examinations are sensible, particularly if the child has blurry distance vision, frequent headaches, squinting, a family history of myopia or a changing prescription.