Short answer: most screen-related eye strain comes from four things, and only one of them costs money to fix. Blink more, move your monitor, match your screen brightness to the room, and look away every twenty minutes. Do those first. If your eyes still feel fried, then look at a filter.
We sell blue light glasses, so treat that with the suspicion it deserves. We would still rather you fix the free things first.
New to these? Start with what blue light glasses are and whether they work, then come back here for the eye strain side.
What Eye Strain Actually Is
Eye strain is not damage. That is the most important thing to understand before you read anything else.
Your eyes get tired the same way any muscle gets tired when it holds one position too long. You are asking them to focus at a fixed distance, under artificial light, at a bright panel, for hours. Then you stop, and they recover.
The clinical name is computer vision syndrome, or digital eye strain. Both describe the same cluster of symptoms, and neither is a disease.
What it usually feels like:
- Tired, heavy or aching eyes late in the day
- Dry or gritty eyes, sometimes watering
- Blurry vision that clears when you look away
- Sore eyes after a long stretch at a monitor
- A dull ache around the brow or temples
What it does not do is permanently harm your vision. Which brings us to the question everyone actually wants answered.
Are Screens Damaging Your Eyes?
No, and we are going to be straight about this even though it is bad for selling glasses.
There is no good evidence that normal screen use causes permanent eye damage in adults. Not from the brightness, not from the blue light. The light coming off your laptop is a fraction of what you get walking outside on a cloudy day. The sun is a far bigger source of blue light than any screen you own.
What screens do cause is discomfort, and that is real. Tired eyes at 6pm are not imaginary. They are just not the same thing as harm.
The one area where the evidence is stronger is sleep. Light in the evening, particularly from a screen held close to your face, affects when your body wants to sleep. That effect is better supported than any of the eye damage claims. We covered it in our post on light and sleep.
If you read a site telling you screens are destroying your retinas, check whether they are selling something. We are, and we are telling you they are not.
The Four Real Causes
Understanding which one is your problem tells you which fix to try.
1. You stop blinking. Blink rate drops sharply when people concentrate on a screen. Less blinking means the tear film dries out. Dry eyes are what most people are actually describing when they say their eyes hurt from the computer, and it is the single most common cause.
2. Your focus never moves. Reading a screen holds the focusing muscle in one position for hours. Nothing about that is dangerous, but it is tiring, in the same way holding one posture all day makes your back ache.
3. Brightness mismatch and glare. A bright screen in a dim room forces your pupil to keep adjusting. A window reflecting off the panel does the same thing. This is the cause people most often blame on their eyes when it is really their desk.
4. An uncorrected vision problem. This one matters most. If you need glasses and do not have them, or your prescription is out of date, your eyes are working overtime to compensate. No amount of screen tweaking will fix that.
Can Screens Cause Headaches?
Yes, long screen sessions can lead to headaches. A dull ache around the brow or temples is one of the most common signs of digital eye strain. But the cause is usually how you use the screen, not the blue light coming from it.
The most common triggers are the same four causes above, plus your posture. McGill University's Office for Science and Society lists glare, dry air, long stretches without a break, a poor desk setup and an out-of-date eye prescription as much stronger risk factors than blue light (McGill OSS). Muscle tension in your neck and shoulders from leaning toward a screen causes most tension headaches (Healthline).
Do blue light glasses help with headaches?
There isn't good evidence that blue light glasses prevent headaches. Some people find a clear lens with less glare more comfortable late in the day, and that is a fair reason to try a pair. But if headaches are your main problem, start with the free fixes below and an eye exam. An out-of-date prescription is a common cause that no filter can fix.
If you get migraines, bright light of any kind can make an attack worse. Talk to your doctor about what helps you.
When a headache needs a doctor
- Headaches most days, even after you fix your desk setup
- Headaches with blurry vision that doesn't clear when you look away
- A sudden, severe headache, or one with vision loss, numbness or confusion. Get urgent medical care for these.
Eye Strain Relief: Start With the Free Fixes
In rough order of how much difference they make.
The 20-20-20 rule
Every 20 minutes, look at something about 20 feet away, for 20 seconds.
That is it. It lets the focusing muscle relax and it makes you blink. It is the most effective thing on this list, it is free, and almost nobody actually does it because remembering is the hard part. Set a timer for the first week until it becomes habit.
Blink on purpose
Sounds silly, works well. Every time you finish a task, close your eyes fully for two seconds. Full closures matter more than fast ones, because a partial blink does not spread the tear film properly.
If your eyes are genuinely dry, preservative-free artificial tears from any pharmacy help and cost very little. That is a better first purchase than glasses if dryness is your main symptom.
Match your screen to the room
Your monitor should look about as bright as a sheet of white paper sitting next to it. Most screens ship far brighter than they need to be, and most people never touch the setting.
Turn the brightness down until the white of a blank document stops looking like a lightbulb.
Move the monitor
About an arm's length away, 50 to 70 cm, with the top of the screen at or slightly below eye level. Looking slightly down means your eyelids cover more of the eye surface, which reduces dryness.
Do not sit with a window directly behind you or directly behind the screen. Sideways to the window is best.
Make text bigger
If you are leaning in to read, the text is too small. Zoom to 125% and stop squinting. Free, instant, and people are strangely reluctant to do it.
Night mode after dark
Every phone, laptop and monitor has it now. Turn it on automatically in the evening. It does some of what a filter lens does, at no cost.
When to See an Optometrist Instead
Some symptoms are not eye strain, and no amount of screen adjustment will help. See an optometrist if you have:
- Blurry vision that does not clear when you look away from the screen
- Persistent headaches, especially around the same time each day
- Double vision
- Eye pain rather than tiredness
- A noticeable change in your vision
- Symptoms that do not improve after two weeks of the fixes above
Most Canadian provinces cover eye exams for children and for adults over 65, and many cover them for everyone at some interval. Check your provincial health plan, because a lot of people pay out of pocket for something they are entitled to.
Get an exam before you spend money on any eyewear. If you need a prescription, that is the fix, and a filter lens is not a substitute for it.
Where Blue Light Glasses Fit
Here is the honest version, from people who sell them.
The research on blue light glasses and eye strain is mixed. Several studies have failed to find a clear benefit for eye strain specifically, and we are not going to pretend that literature says something it does not.
What our customers consistently report is narrower than the marketing claims: less glare and more comfort in the last few hours of a working day.
So the sensible position is this. If dryness is your problem, artificial tears and the 20-20-20 rule will do more. If glare and late-day fatigue is your problem, a filter is worth trying. If evening screens are keeping you awake, clear lenses won’t do much. Amber lenses and night mode are the better tools, which we explain in blue light glasses for sleep.
They cost under $50 here, ship free across Canada, and you have 25 days to send them back if nothing changes. That is a reasonable thing to try after the free fixes, and an unreasonable thing to try instead of them.
If you want to try a pair, our computer glasses collection is built around desk work. There are also frames sorted by fit in men's, women's and kids'.
Before you buy, read how blue light glasses compare against just changing your screen settings. It is a fairer comparison than most sellers will give you.
A Realistic Desk Setup
If you want one checklist to work through, this is it.
- Monitor an arm's length away, top of screen at or just below eye level
- Screen brightness matched to the room, not maxed out
- No window directly behind you or behind the screen
- Text zoomed until you are not leaning in
- Timer for the 20-20-20 rule until it becomes habit
- Artificial tears in the drawer if you get dry eyes
- Night mode on automatically after sunset
- An eye exam if any of this is new or getting worse
Work through those and most people find the 6pm fried feeling either goes away or drops enough to stop mattering.
Common Questions
Can eye strain cause permanent damage?
No. It is fatigue, not injury. The symptoms resolve with rest. If yours do not resolve, that suggests something other than eye strain and is worth an appointment.
Why do my eyes hurt after work but feel fine at the weekend?
That pattern is the clearest sign it is screen related rather than a vision problem. It also means the fixes above are likely to work.
Do eye exercises help?
The 20-20-20 rule genuinely does, because it relaxes the focusing muscle and prompts blinking. More elaborate eye exercise routines sold online have very little evidence behind them.
Is blue light from screens worse than sunlight?
No, and it is not close. You get far more blue light on a walk outside than from a full day at a monitor. Anyone claiming your laptop is a serious blue light hazard is overstating it.
My child gets sore eyes after school. Same advice?
Mostly, but start with an eye exam. Most provinces cover children's exams, and uncorrected vision is a more common cause in children than in adults. There is more in our kids' section.
Why do I get headaches from my computer?
Usually it's eye strain, glare, too few breaks or neck tension from your posture, not blue light. Try the 20-20-20 rule, match your screen brightness to the room and raise your monitor to eye level. If headaches continue, get an eye exam. An out-of-date prescription is a common cause.
What if I have tried everything here?
Then it is an appointment, not a purchase. Email us if you want a second opinion on your setup first, but do not keep buying things to solve a problem that might need an optometrist.
About the author
Jesse Robert has spent five years working in blue light eyewear and started BlueLightGlasses.ca in 2022. He is not an optometrist, and these guides are not medical advice.
He writes them himself, and he will tell you when blue light glasses are not the answer.
Questions about fit or filtering? Email us and a person will reply.
