<p>Children's eyes need sun protection as much as their skin, but sunglasses labels can be confusing. This guide explains what UV400 and 100% UV protection mean, which features don't add UV protection, and how to choose a pair your child will actually wear on holiday.</p>
Last reviewed: November 2026. This guide draws on two American Academy of Ophthalmology (AAO) pages, “How to Choose the Best Sunglasses to Avoid Sun Damage” (July 2026) and “Being EyeSmart in the Sun”, the American Academy of Pediatrics’ HealthyChildren.org page “Sun Safety” (August 2024) and the NHS page “Sunscreen and sun safety” (March 2026). It’s general information, not medical advice. If your child has an eye condition, wears prescription glasses or has eye pain, see an optician or eye doctor.
Many children’s sunglasses are bought as toys: bright frames, cartoon characters, a few euros at the beach shop. Some offer full UV protection and some don’t, and you can’t tell by looking at the lenses. The good news is that the label tells you most of what you need, and a well-labelled pair doesn’t have to be expensive.
Quick answer
- Look for the label. The AAO advises choosing sunglasses labelled UV400 or 100% UV protection, which block both UV-A and UV-B. It says “UV absorption up to 400nm” is equivalent.
- The AAP says children’s sunglasses should block at least 99% of UV rays, and to look for youth sizes.
- In the UK, the NHS recommends sunglasses with wraparound lenses or wide arms, with the CE mark and British Standard mark 12312-1:2013 E.
- Darker isn’t safer. The AAO says darker lenses don’t necessarily give more protection.
- Price isn’t the test. The AAO says inexpensive sunglasses labelled 100% UV-blocking are better than designer pairs with no UV protection.
- Add a hat. The AAO recommends wearing a hat with sunglasses, and says broad-brimmed hats are best.
Why children’s eyes need protecting
The AAO says babies and children need hats and sunglasses, because unprotected sun exposure adds damage that can contribute to serious eye disorders later. It advises keeping children out of direct sunlight in the middle of the day and making sure they wear sunglasses and hats whenever they’re in the sun.
It also points out a few things that matter on holiday. UV exposure is higher when sunlight reflects off water, ice or snow, and higher at altitude. Clouds and haze don’t block UV, and eye damage can happen at any time of year, not only in summer.
For babies under 6 months, both the NHS and the AAP say to keep them out of direct sunlight. Shade, a canopy and a hat come before sunglasses at that age.
Reading the label
| You see | What it means |
|---|---|
| “100% UV protection” or “UV400” | The AAO says these block both UV-A and UV-B. This is what to look for |
| “UV absorption up to 400nm” | The AAO treats this as the same as 100% UV absorption |
| Blocks at least 99% of UV | The minimum the AAP recommends for children |
| CE mark and BS EN ISO 12312-1 | The NHS recommends the CE mark and British Standard mark 12312-1:2013 E |
| Partial protection, or no UV information | The AAO doesn’t recommend partial protection. Without a label, you can’t tell |
If you’re unsure about a pair you already own, the AAO says an optical shop can test a pair’s UV protection. It also says it’s unclear whether UV protection fades over time.
Features that don’t add UV protection
- Dark lenses. The AAO says only UV-blocking lenses provide the protection you need, and darker lenses don’t necessarily offer more.
- Coloured lenses. The AAO says amber or grey lenses don’t necessarily block more sun.
- Polarised lenses. The AAO says polarisation reduces glare from water and roads, but doesn’t itself block UV. Check the label for UV protection as well.
- Mirror finishes. The AAO says these reduce visible light but don’t fully protect against UV.
In short: the only reliable guide is the UV label, not how the lenses look.
Fit: getting a pair that works and stays on
The AAO says larger lenses shield more of the eye, and wraparound styles block UV from the sides. The NHS also recommends wraparound lenses or wide arms. For a child, that means:
- Size. The AAP says to look for youth sizes. Adult frames slide down a small nose and leave gaps.
- Closeness. The frame should sit close to the face without touching the eyelashes.
- Coverage at the sides. Wraparound lenses or wide arms reduce light from the side.
- Comfort. Flexible frames and soft nose pads make it more likely that a toddler will keep them on.
- Straps. An adjustable strap helps glasses stay on during play. Check the maker’s age guidance, and take straps and cords off at nap time.
Lens material and durability
The AAO says all sunglasses sold in the US must meet FDA impact safety standards, that no lens is unbreakable, and that plastic is less likely than glass to shatter. It suggests polycarbonate for sports because of its impact strength, and a scratch-resistant coating because uncoated polycarbonate scratches easily. Children drop, sit on and chew sunglasses, so a hard case is worth packing.
Step-by-step checklist by age and trip
| Age or situation | What to plan |
|---|---|
| Under 6 months | Shade first, as the NHS and AAP advise. Use a hat and a stroller canopy. See our guide to stroller shade and cooling |
| Toddlers | A small, flexible frame with a soft strap, plus a wide-brimmed hat. Expect some refusal: hats alone still help |
| School-age children | Youth-size wraparound frames. Let them choose a colour, which can help them actually wear them |
| Beach and pool | The AAO says UV exposure is higher when sunlight reflects off water. A strap or retainer stops glasses sinking |
| Snow and mountains | The AAO says ordinary sunglasses don’t protect against snowfields, which need special lens filters. Look at goggles or glacier-style glasses made for children. See our guide to ski trips with young kids |
| Children with prescription glasses | Ask your optician about prescription sunglasses or clip-ons |
Shopping by category
These Amazon searches cover the main types: toddler sunglasses with a strap, flexible kids’ sunglasses, kids’ ski goggles and hard cases. We haven’t tested these products and don’t rank them. Check that the listing and the product label say UV400 or 100% UV protection.
As an Amazon Associate we earn from qualifying purchases. Read our affiliate disclosure.
Common mistakes
- Buying toy sunglasses without a label. You can’t tell UV protection by looking.
- Choosing the darkest pair. The AAO says darkness doesn’t mean more UV protection.
- Assuming polarised means UV-safe. The AAO says it doesn’t, on its own.
- Using adult sizes. They leave gaps and slip off.
- Forgetting cloudy days. The AAO says clouds and haze don’t block UV.
- Using beach sunglasses on snow. The AAO says snowfields need special filters.
Next steps
Pair sunglasses with clothing and a hat; see our UPF clothing guide for toddlers. For a full day out, use our summer holiday packing list.
Final thoughts
<p>Check the label first: 100% UV protection, UV absorption up to 400nm or UV400. Don't judge by darkness, colour, polarisation or price. Choose a size that fits closely, with wraparound or wide arms, and add a wide-brimmed hat. If your child has an eye condition, wears glasses or complains of eye pain or sensitivity, see an optician or eye doctor.</p>
Frequently asked questions
What does UV400 mean?
The AAO treats "UV absorption up to 400nm" as the same as 100% UV absorption, and recommends sunglasses labelled UV400 or 100% UV protection.
At what age should children wear sunglasses?
The AAO says babies and children need hats and sunglasses in the sun. For babies under 6 months, the NHS and AAP say to keep them out of direct sunlight altogether.
Are cheap kids' sunglasses safe?
The AAO says inexpensive pairs labelled 100% UV-blocking are better than designer pairs with no UV protection. The label matters, not the price.
Are polarised sunglasses better for kids?
The AAO says polarisation reduces glare, but doesn't block UV by itself. Check for a UV400 or 100% UV label too.
Do kids need sunglasses on cloudy days?
The AAO says clouds and haze don't block UV light.
