Blue Light Glasses: Separating Science from Marketing
Blue light glasses have been marketed as the cure for digital eye strain. The truth is messier. Some claims hold up. Some do not. Here is what the research actually says and who should bother with blue light coating.
What the Research Says
A 2021 Cochrane review (the gold standard for medical evidence) looked at 17 randomized controlled trials. The conclusion: there is no strong evidence that blue light glasses reduce digital eye strain. The symptoms people blame on blue light - tired eyes, headaches, dryness - are more likely caused by how we use screens, not the light spectrum from them.
We blink about 15 times per minute normally. Looking at a screen, that drops to about 5-7 times. Dry eyes and the resulting discomfort come from not blinking enough, not from blue light wavelengths hitting your retina.
Where blue light does have evidence: sleep disruption. Blue light suppresses melatonin production. Using screens within 2 hours of bedtime makes it harder to fall asleep. Blue light filtering in the evening helps with this - but so does turning on your phone's Night Shift mode for free.
Who Actually Benefits
Night shift workers and people who use screens late at night get the most benefit. If your job has you staring at a monitor until midnight, blue light coating might help you fall asleep faster after work. If you mostly use screens during daylight hours, the benefit is minimal.
Migraine sufferers sometimes report that blue light filtering helps reduce attack frequency triggered by screen exposure. The evidence for this is mostly anecdotal, but if you get migraines from screens, it is a low-cost experiment worth trying.
Fytoo Includes It Free
Here is the practical bottom line: Fytoo includes blue light filtering as a free add-on. It costs nothing. It might help with sleep if you use screens at night. The research does not support the dramatic marketing claims, but at zero dollars, there is no reason not to get it. If an optometrist charges $50 for blue light coating, skip it. If it is free, take it.
Affiliate link · We earn a commission at no extra cost to you
FAQ
Do blue light glasses actually work?
For reducing eye strain during the day: the evidence says probably not. Your eye strain is more likely from not blinking enough and focusing at one distance for hours. For sleep: yes, reducing blue light exposure before bed helps you fall asleep. You can also just use Night Mode on your devices.
Should I get blue light coating on my glasses?
If it is free (like at Fytoo), yes. Why not. If someone wants to charge you $30-50 for it, probably skip it. The benefit for most people is small and there are free alternatives.
What is the 20-20-20 rule?
Every 20 minutes, look at something 20 feet away for 20 seconds. This gives your eye muscles a break from constant close-up focus. This simple habit probably does more for eye strain than any lens coating.