Are blue light glasses for kids really useful?
Screens follow children everywhere: school, homework, tablets, video games, family TV time. With this exposure comes a flood of questions, and a booming offer of blue light glasses. Are they really useful for young eyes, or are they just marketing? Here is what the science actually says.
Blue light: what it actually is
Blue light is a portion of the visible spectrum (wavelengths 380 to 500 nm). It exists naturally in sunlight. That's what gives the sky its colour. It's also emitted by every LED screen: phones, tablets, computers, televisions.
One important nuance: not all blue light is harmful. Turquoise-blue light (470-500 nm) plays an essential role in regulating the circadian rhythm. It's violet-blue light (380-450 nm), abundantly emitted by screens, that raises concerns.
Why children are more exposed and more sensitive
Two reasons:
- Screen exposure that's exploding: from age 6, average screen time far exceeds pediatric recommendations. With the digitisation of schools, this time is no longer purely recreational.
- Higher lens transparency: in a child under 10, the lens allows significantly more blue light to reach the retina than in adulthood. The eye's natural filters develop over time.
What the studies say
The scientific evidence on screen-emitted blue light is nuanced. ANSES, in its 2019 report, concludes that the blue light emitted by current screens remains at low levels compared to sunlight. The immediate risk of retinal damage from screens is considered low.
That said, several indirect effects are well documented:
- Digital eye strain: itchy eyes, blurred vision at the end of the day, headaches. Widely recognised, especially in children with extended screen time.
- Impact on sleep: evening screen exposure disrupts melatonin secretion and delays sleep onset. Probably the best-established effect.
- Long-term effects: still under investigation. The precautionary principle remains the rule for young eyes.
When blue light glasses are genuinely useful
Blue light glasses are neither a gadget nor a miracle cure. They make sense in specific cases:
- Child spending more than 1 hour a day on a screen: documented eye strain.
- Homework or tablet play late in the day: to limit sleep impact.
- Recurring eye discomfort: red eyes, itching, headaches after screen sessions.
- Child with myopia or corrective lenses: combining screen protection with correction is often recommended.
Conversely, a child who only uses screens occasionally doesn't need daily blue light glasses.
How to choose: the real criteria
Three benchmarks to find your way:
- Harmful blue light filtration rate: must be clearly indicated as a percentage. Below 30%, the effect is marginal. Olivio & Co lenses filter up to 40% of blue light.
- Preserved transparency: lenses should not alter colour perception. Good filters remain nearly transparent.
- An age-appropriate fit: lightweight TR90 frame, flexible temples, comfortable for several hours of wear.
Discover our selection: blue light glasses for the whole family, with versions for kids, juniors, teens and adults to match every member of the household.
And what about screen time itself?
Glasses don't replace setting limits. Pediatric recommendations converge on the 3-6-9-12 rule:
- No screens before age 3
- No personal console before age 6
- No solo internet before age 9
- No social media before age 12
Frequently asked questions
From what age should a child wear blue light glasses?
As soon as they start using screens regularly, generally from age 6. Before that, limiting exposure is more effective than compensating with eyewear.
Should they be worn all day?
No. These glasses are only useful in front of screens. Outdoors or away from screens, they serve no purpose.
Is a prescription required?
No for non-corrective models. If the child already wears prescription glasses, correction and blue light filter can be combined on the same pair. Ask your optician.