Sunglasses are often seen as a summer essential — part style, part practicality.
But not all sunglasses offer the same level of protection.
In fact, some can do very little to protect your eyes at all.
And because many people assume darker lenses automatically mean better protection, it’s easy to get caught out.
So how can you tell if your sunglasses are genuinely protecting your eyes?
Here’s what to look for.
Why UV protection matters
Just like your skin, your eyes are exposed to ultraviolet (UV) radiation every day.
Over time, repeated exposure can contribute to long-term eye health issues, including:
- Cataracts
- Photokeratitis (sunburn of the eye)
- Damage to the surface of the eye
- Increased risk of age-related eye conditions
And it’s not just a holiday concern.
UV rays can affect your eyes all year round — even on cloudy days.
That’s why protection matters beyond summer.
What does UV400 actually mean?
If you’ve ever seen UV400 on a sunglasses label, it’s worth paying attention.
UV400 means the lenses block wavelengths of light up to 400 nanometres — covering 100% of UVA and UVB rays.
This is the gold standard for everyday sunglass protection.
Without it, sunglasses may reduce brightness but still allow harmful UV rays through.
And because darker lenses cause your pupils to widen, poor-quality sunglasses without UV protection can actually expose your eyes to more damage.
Polarised vs UV protection: what’s the difference?
This is one of the most common misunderstandings.
UV protection
Protects your eyes from harmful ultraviolet rays.
Polarised lenses
Reduce glare from reflective surfaces such as water, roads and glass.
Polarisation improves visual comfort and clarity, but it does not automatically mean UV protection.
The best sunglasses often combine both.
This is especially useful for:
- Driving
- Water sports
- Beach days
- Outdoor walks
- Bright city environments
Myth: darker lenses mean better protection
Not necessarily.
Lens colour has very little to do with UV protection.
A pale lens with UV400 can protect your eyes better than a dark lens without it.
Colour mainly affects:
- How bright things feel
- Contrast
- Visual comfort
- Style preference
Protection comes from the lens treatment, not the tint.
How to choose sunglasses that properly protect your eyes
When shopping for sunglasses, look for:
UV400 or 100% UVA/UVB protection
This should always be the starting point.
Good coverage
Larger lenses or well-fitted frames help reduce light entering from the sides.
Polarised options (if needed)
Particularly useful for reducing glare in bright environments.
Quality lenses
Clear, distortion-free vision matters too.
Poor-quality lenses can cause unnecessary strain, even if they look good.
Don’t forget children’s eyes
Children’s eyes are more sensitive to UV light than adults’.
Because their eyes are still developing, protecting them early is especially important.
Good-quality sunglasses for children aren’t just about style — they’re part of long-term eye care.
A simple summer check
If your sunglasses are scratched, old, unlabelled or bought purely for fashion, it may be worth checking whether they’re giving your eyes the protection they need.
The right sunglasses should do both:
look good and protect well.
Because when it comes to eye health, style and function should work together.
Find sunglasses that do both
At Eye Emporium, we can help you find sunglasses that combine proper UV protection with styles that suit your lifestyle. Explore our sunglasses collection or visit your local practice for expert advice.
