Signs Your Child Needs Glasses (and Why Screenings Miss Them)
Watch for sitting too close to screens, holding books right up to their face, squinting, tilting their head, covering one eye, rubbing their eyes constantly, headaches after homework, or giving up on reading quickly. Any one of those is worth an exam. And here’s the part most parents don’t know: passing the school vision screening does not rule it out.
Children almost never say “I can’t see.”
They say the board is boring. They say reading is stupid. They wriggle, they lose their place, they get a headache after twenty minutes of homework, and everyone assumes it’s concentration.
Sometimes it is. Often it isn’t.
Quick Takeaways
- A school screening checks distance letters. That’s a fraction of what matters.
- New Jersey screens every other year, kindergarten through grade 10.
- Your child can pass a screening at 20/20 and still have a real problem.
- A child who has always seen this way has no idea anything is wrong.
- One weak eye often causes zero symptoms, and that’s the one that matters most.
What to actually look for
The signs fall into four groups: getting too close to things, doing something odd with their head or one eye, touching their eyes constantly, and struggling with near work in ways that look like a behaviour problem. That last group is the one that gets missed.
They get too close. Sitting right up against the TV. Holding a book or tablet inches from their face. Squinting at things across the room.
The American Optometric Association lists sitting close to the TV, holding a book too close and squinting among the signs worth acting on.
They do something odd with their head or one eye. Tilting the head to one side. Turning to look out of the corner. Covering or closing one eye to focus.
Also: one eye that drifts in or out, even occasionally. The National Eye Institute flags squinting, shutting one eye and head tilting specifically.
They’re always at their eyes. Rubbing constantly. Blinking far more than usual, especially during close work.
The CDC puts it simply: if you notice your child squinting, rubbing their eyes, or complaining of headaches after schoolwork, have their vision checked.
And the group that looks like something else entirely.
This is the AOA’s list for school-aged children, and it’s worth reading twice: complaints of discomfort and fatigue, frequent eye rubbing or blinking, short attention span, avoiding reading and other close activities, frequent headaches.
Short attention span. Avoiding reading.
Those are the two that get filed under personality or effort rather than eyesight, and they’re the two I hear most often from parents who are surprised by what we find.
Losing their place, or reading the same line twice. The AOA also lists losing place while reading and difficulty recalling what was read. If homework is a fight and reading is where it starts, that’s worth a look before you assume it’s motivation.
Clumsiness and poor hand-eye coordination belong on the list too. The NHS names both.
Why your child won’t tell you
Because they don’t know anything is wrong. A child who has been short-sighted since they were four has never seen a sharp world to compare it against. Blurry is just what things look like. They’re not hiding it from you, and they’re not being difficult. It genuinely hasn’t occurred to them that other people see something different.
This is the single most useful thing I can tell a parent, and it’s the reason “they’d say something” doesn’t hold up.
Prevent Blindness puts the same point plainly: your child may still have an eye problem even if they don’t complain and haven’t shown any unusual signs.
There’s a second thing that happens.
Children are excellent at passing tests they don’t want to fail.
They memorise the chart while waiting. They peek around the occluder. They guess confidently, because a wrong answer feels like getting in trouble. None of it is deliberate deception. It’s a seven-year-old wanting to do well.
A proper exam doesn’t rely on a child telling the truth about what they can see. That matters more than it sounds.
A school screening is not an eye exam
A screening asks one question: can this child read letters at distance. An exam asks whether both eyes focus, work together, track a line of text, and are healthy. A child can sail through the first while failing badly at the second, and nothing about the “pass” would tell you.
The AOA doesn’t hedge on this.
A vision screening is not a comprehensive exam.
American Optometric Association, School-Aged VisionThey go further on the preschool page: screenings can’t be used to diagnose an eye or vision problem, and may miss as many as 60% of children with vision problems.
Here’s what each one actually covers.
School screening
- Reading letters on a chart at distance
- Sometimes a photoscreener device
- Run by the school nurse, in minutes
- Result is pass or refer, never a diagnosis
- Nothing on near vision or focusing
- Nothing on how the two eyes work together
- Nothing on eye health
Comprehensive exam
- Vision measured at near and distance
- Each eye separately, then together
- Focusing, tracking and eye teaming
- Colour vision
- Full eye health check, dilated if needed
- A diagnosis, not a referral
- A plan: glasses, patching, myopia control
Look at the length of those two lists. That gap is the whole argument.
And note what the AOA says about the 20/20 result specifically: a child can pass a school screening and still have problems with focusing, tracking or eye coordination.
Twenty-twenty means they could read a letter across the room. It says nothing about whether they can hold a book in focus for thirty minutes without their eyes drifting apart.
What New Jersey actually requires
New Jersey requires a vision screening at school, not an eye exam. The state’s rule is that screening for visual acuity is conducted biennially for students in kindergarten through grade 10. Biennially means every other year. So a child can go two full school years between checks, and every one of those checks is letters on a chart.
That comes from N.J.A.C. 6A:16-2.2, as set out in the Department of Education’s own summary of school health mandates.
Read the wording carefully. Screening for visual acuity.
The state itself is telling you what the test is. It’s the distance chart. Nothing in the mandate covers focusing, eye teaming, or the health of the eye.
A small oddity, if you like this sort of thing
New Jersey’s school health statute, N.J.S.A. 18A:40-4, requires pupils to be examined for physical defects and then specifically names one sensory screening by law: hearing.
Vision isn’t named in the statute. It comes from the administrative code instead.
Vision screening is genuinely required in New Jersey either way. But a state that writes hearing into law and leaves vision to regulation tells you something about how the two get weighted.
What New Jersey does not require is a comprehensive eye exam before a child starts school. A small number of states mandate that. New Jersey isn’t one of them.
Which means for most children here, whether anyone ever properly examines their eyes is a decision their parents make. Nobody will chase you about it.
Book your child a proper eye exam
We’re open seven days a week inside Target Optical on 14th Street in Jersey City, and we accept most medical and vision plans including Medicare and Medicaid. Children’s eye exams are unhurried and built around kids who can’t yet read a chart.
Why one weak eye is the real worry
If one eye sees well and the other doesn’t, your child has no symptoms at all. They see fine, because the good eye does the work. They’ll pass a screening if the good eye is tested first and they peek. Meanwhile the brain quietly stops using the weaker eye, and past a certain point that becomes permanent.
This is amblyopia, and it’s the reason I push on children’s exams harder than almost anything else.
The CDC describes it as the eye and the brain not working together properly, affecting an estimated 2 to 3% of the population.
And this, which is the sentence that should make every parent book:
Unless it’s successfully treated in early childhood, amblyopia usually lasts into adulthood. The CDC calls it the most common cause of permanent one-eye vision impairment among children and young and middle-aged adults.
The National Eye Institute is blunt about timing. Start treating early, the sooner the better. Kids who grow up without treatment may have lifelong vision problems.
I want to be accurate about one thing here, because a lot of articles aren’t.
You’ll read that amblyopia can only be treated before age seven or eight. That overstates it. Cleveland Clinic says it’s possible to treat in teenagers, but that it takes longer and is usually less effective.
So there’s no cliff edge at a birthday. What there is, is a steadily closing window. Earlier is better, every year, and the treatment is usually glasses and patching rather than anything dramatic.
Screens, outdoors and short-sightedness
Short-sightedness in children is genuinely rising, and it usually starts between ages 6 and 14. But the evidence on screens is weaker than the headlines suggest. What’s much better established is the other side of it: children who spend more time outdoors are less likely to become short-sighted.
Start with the trend, because it’s real. About 41.6% of Americans are now nearsighted, up from 25% in 1971.
And it matters beyond thicker lenses. Higher levels of short-sightedness carry a higher lifetime risk of retinal detachment, glaucoma and cataract. That’s why slowing it down in childhood is worth doing.
Now the part where I’d push back on the internet.
The AOA looked at the research linking device use to short-sightedness and stated it directly: those studies found an association with myopia and not a causation.
The CDC’s position on screens is narrower than most people assume too. Increased screen time can make uncorrected vision problems worse. That’s the screen revealing a problem, not creating one.
Meanwhile the outdoor evidence has actual numbers attached.
The NEI reports that an average of two hours a day of outdoor light exposure at school reduced myopia incidence by 63.7%. A separate trial adding 40 minutes of outdoor class time a day to six-year-olds cut the rate of new short-sightedness over three years.
And it isn’t simply that outdoor time means less reading. Research found time spent outside is independent of time spent reading. It’s the being outside that does it.
So the useful advice isn’t “take the iPad away.” It’s get them outside, and get any uncorrected prescription corrected. If your child is already becoming short-sighted, there are treatments that slow how fast it progresses, and we cover those on our myopia control page. Ask about them early rather than after a few years of rapid change.
What actually happens at a children’s eye exam
Nothing that requires your child to read, and nothing that requires them to give reliable answers. We can measure a prescription objectively, without asking a single question. For a nervous four-year-old that’s the whole game.
- A chat first. What you’ve noticed at home, how school is going, family history of glasses or a turned eye. This tells me where to look.
- Vision, in a form they can manage. Pictures and shapes for children who don’t know letters yet. Each eye separately, and properly covered.
- The objective measurement. I can find the prescription by looking at how light reflects out of the eye. Your child doesn’t have to say anything, so there’s nothing to guess at.
- How the eyes work as a pair. Tracking, teaming, focusing, and whether one eye drifts. This is the part a screening never touches.
- Eye health. A look inside, with dilating drops where it’s needed. Fifteen minutes for the drops, a few hours of light sensitivity afterwards.
- What we found, in plain language. Whether they need glasses, whether we’re watching something, and when to come back.
On timing, there’s an honest disagreement worth knowing about.
The AOA recommends a first comprehensive exam between 6 and 12 months, another between 3 and 5, one before first grade, and annually after that.
The American Academy of Pediatrics takes a screening-first approach instead, with referral to an eye doctor if a screening is failed. The US Preventive Services Task Force recommends vision screening at least once between ages 3 and 5.
I’m an optometrist and I hold the AOA position, so take that for what it’s worth. But you should know the two professions genuinely differ rather than reading one as settled fact.
The practical version: if you’ve noticed anything on the list at the top of this page, don’t wait for a screening cycle.
Frequently asked questions
My child passed the school vision screening. Do they still need an eye exam?
Yes, and this is the most common misunderstanding I deal with. The AOA states plainly that a vision screening is not a comprehensive exam, that screenings can’t be used to diagnose anything, and that they may miss as many as 60% of children with vision problems.
A screening tests distance letters. A child can read those perfectly and still struggle to focus on a book, keep both eyes working together, or track a line of text.
At what age should my child have their first eye exam?
The AOA recommends a first comprehensive exam between 6 and 12 months, a second between ages 3 and 5, one before first grade, and yearly after that.
Paediatric guidance differs and leans on screening with referral if a child fails. If you’ve noticed any of the signs above, don’t wait for either schedule. Book.
Will wearing glasses make my child’s eyes weaker?
No. Glasses focus light onto the retina while they’re being worn. They don’t change the shape of the eye or weaken any muscle, and taking them off doesn’t leave a child worse than before.
What people are noticing is that the world looks blurrier after you take glasses off than it did before you ever wore them. That’s not the glasses. That’s you finally knowing what sharp looks like. The real risk runs the other way: leaving a young child’s prescription uncorrected is what can cause lasting harm.
Will my child grow out of it?
Some things do settle, and mild long-sightedness in a young child is often normal. But short-sightedness doesn’t work that way. The NEI notes it usually starts between ages 6 and 14 and gets worse into the early twenties.
Amblyopia definitely doesn’t resolve by itself. The CDC says untreated, it usually lasts into adulthood. “Wait and see” is the one approach that reliably costs something.
Are screens damaging my child’s eyes?
Less than you’ve been told. The AOA reviewed the device research and said it found an association with short-sightedness, not a causation. The CDC’s actual position is that screen time can make uncorrected vision problems more noticeable.
The better-evidenced lever is outdoor time. Around two hours a day of outdoor light at school has been linked to a large reduction in new cases of short-sightedness, and the effect appears independent of how much reading a child does.
My child has one eye that turns in sometimes. Is that urgent?
Get it looked at rather than waiting for the next screening. An eye that drifts in, out, up or down is one of the routes to amblyopia, and the child usually has no symptoms because the straight eye is doing all the work.
Treatment is generally glasses and patching, and it works considerably better the earlier it starts.
Owner & lead optometrist at Vista Vision in Jersey City, focused on glaucoma and dry eye. View full profile →
This article is general information, not medical advice, and it can’t diagnose your child. If you’ve noticed a change in your child’s eyes or vision, book an eye exam rather than waiting for a school screening.