Short answer: screen headaches are real, but blue light usually isn't the cause. Most come from how we use screens: focusing up close for hours, blinking less, glare, a screen that's too bright or too dim, poor posture, or an out-of-date glasses prescription. For people with migraine, bright light of almost any color can make an attack worse. The fixes that help most are breaks, a better screen setup and an eye exam.
Below: what actually causes screen headaches, where light and sleep fit in, and what to do about it.
A Little About Blue Light
Blue light is the part of visible light between roughly 400 and 500nm. The sun is by far the biggest source. Screens, LED bulbs and fluorescent lighting give off blue light too, at much lower levels than daylight.
During the day, blue light helps you feel alert. In the evening, bright, blue-rich light can delay the body clock's wind-down toward sleep.
Does Blue Light Cause Headaches?
There's no good evidence that blue light from screens causes headaches. The American Academy of Ophthalmology says the light from screens doesn't damage the eyes, and that the discomfort people feel comes from how screens are used.
Screen-related headaches usually come from a mix of these:
- Digital eye strain: focusing up close for long periods tires the eye's focusing muscles
- Blinking less: we blink far less when concentrating on a screen, so eyes dry out
- Glare and brightness: reflections, or a screen much brighter or dimmer than the room
- Posture: tension in the neck and shoulders from leaning in or looking up or down
- Uncorrected vision: an out-of-date prescription, or needing glasses and not knowing it
- Everything else: dehydration, skipped meals, caffeine, stress and short sleep
How Screens Can Affect Sleep
Late-night screen use can push bedtime later, and bright, blue-rich light in the evening can delay the rise of melatonin, the hormone that tells your body it's getting dark. Short or broken sleep is a common headache trigger in its own right, so screens in bed can contribute indirectly.
Light Sensitivity and Migraine
Most people with migraine find light uncomfortable during an attack. In a 2016 study of people with migraine, white, blue, amber and red light all made headache worse for around 80% of participants. Green light was the least bothersome, and at low intensity some people found it eased their pain slightly.
So the finding isn't that blue light is the problem: it's that bright light in general is hard to tolerate during migraine, with green light the gentlest. That's why dimming lights and screens during an attack often helps.
Some people with light sensitivity find tinted lenses more comfortable under bright indoor lighting. Harmony, our rose FL-41 lens, filters most strongly around 480–520nm (47.74% peak blocking at 510nm) and lets through 67.56% of visible light. It isn't a migraine treatment. If you have migraines or new light sensitivity, talk to your doctor. There's more in our post on blue light glasses and migraines.
How to Stop Screen Headaches
Take Regular Breaks
Use the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds. Every hour or so, get up and move for a few minutes.
Set Up Your Screen
- Keep the screen about an arm's length away, with the top at or just below eye level
- Match screen brightness to the room: not glaring in a dim room, not dim in a bright one
- Move lamps or angle the screen so windows and lights don't reflect in it
- Make text big enough to read without leaning in
Improve Your Posture
Poor posture puts tension on the neck and shoulders, which is a common source of tension headaches. Sit back in a supportive chair, keep your feet flat and your shoulders relaxed, and bring the screen to you rather than leaning toward it.
Keep Your Eyes Comfortable
Blink fully and often, especially during long sessions. If your eyes feel dry, lubricating eye drops can help. Ask a pharmacist which kind suits you.
Use Night Mode in the Evening
Most phones and computers have a "night light" or "night shift" setting that warms the screen in the evening. Set it to turn on automatically at sunset, and turn brightness down at night.
Get an Eye Exam
An out-of-date prescription, or a small uncorrected focusing problem, is one of the most common causes of headaches at a screen. If you haven't had an eye exam in the last two years, book one.
Where Blue Light Glasses Fit In
To be clear about what the evidence shows: a 2023 Cochrane review found that blue light filtering glasses probably make no difference to eye strain in the short term, and there's no good evidence they prevent headaches. Some people simply prefer a warmer-looking screen, and that's a fine reason to wear them.
Where they have a clearer purpose is the evening. An orange lens, which blocks 99% of light across 380–550nm, cuts most blue light in the two to three hours before bed, as part of a routine that protects your sleep. Our figures are measured by Micro-Light Optics and published on our science page.
When to See a Doctor
See your doctor or an optometrist if your headaches are frequent, severe or getting worse, if they come with changes in your vision, or if they don't improve after changing your screen habits. Get urgent help for a sudden, very severe headache.
Frequently Asked Questions
Why Does Blue Light Give Me Headaches?
It probably isn't the blue light itself. Headaches at a screen usually come from eye strain, blinking less, glare, posture or an out-of-date prescription. If you have migraine, bright light of most colors can make an attack worse.
How Do You Get Rid of a Screen Headache?
Step away from the screen, rest your eyes, drink some water and dim the lights. To prevent the next one, take regular breaks, fix your screen setup and posture, and get your eyes checked.
Do Blue Light Glasses Help With Headaches?
The evidence doesn't show that they do. Breaks, screen setup, posture and an up-to-date prescription do far more.
How Do You Fix Light-Sensitive Eyes?
Start with an eye exam to rule out an underlying cause. Wear sunglasses outdoors, keep screens and room lights dimmer, and use eye drops if dryness is part of it. Some people find tinted lenses more comfortable indoors.
Why Am I So Sensitive to Light?
Light sensitivity is common with migraine, dry eyes and some eye conditions, and can be a side effect of some medications. If it's new or getting worse, see an optometrist or doctor.
Conclusion
Screen headaches are common, but blue light is rarely to blame. Most come from eye strain, glare, posture and old prescriptions, and they usually improve with regular breaks, a better screen setup and an eye exam. If you have migraine, bright light in general is the issue during an attack, not blue light alone. And if headaches persist, see a professional.
