Are polarised sunglasses worth it? When you need them and when you don't

Short answer: Polarised sunglasses are worth it if you spend a lot of time around glare – on or near water, on snow, or driving on wet, sunlit roads. For everyday city wear, they're a comfort upgrade, not a necessity. And polarisation doesn't protect your eyes from UV: that comes from a UV400 filter, which every pair of sunglasses should have, polarised or not.

What are polarised sunglasses?

When sunlight bounces off a flat surface such as water, a wet road or a car bonnet, much of the reflected light ends up vibrating in one direction – roughly horizontally. That concentrated reflection is what you experience as glare. A polarised lens contains a filter with a vertical orientation that blocks much of this horizontal light while letting the rest through. The result: less glare, calmer contrast and less squinting.

Are polarised sunglasses better for your eyes?

Not in terms of protection. Polarisation is about visual comfort. Protection against UV comes from the lens's UV filter, and darkness comes from its category. A polarised lens without a proper UV filter doesn't protect your eyes; a non-polarised lens with UV400 does. If the labels are confusing, our guide to what UV400 and category 3 mean explains them.

When are polarised sunglasses worth it?

• By the water: sailing, fishing, paddling or long beach days. Glare off water is where polarisation makes the biggest difference.
• Driving: many drivers find glare from wet roads and bonnets easier to handle with polarised lenses. Stick to category 2 or 3 behind the wheel.
• Outdoor sport: cycling, running or hiking in bright light. A close-fitting, wrap frame like those in our sport sunglasses also cuts light from the sides.
• Everyday city wear: nice to have, not essential. UV400, the right category and a frame that fits matter more.

What are the downsides of polarised lenses?

• Screens: some phone, car dashboard and cash-machine displays can look dark, patchy or rainbow-coloured through them.
• Snow and ice: some skiers prefer non-polarised lenses, because glare off an icy patch is a useful warning.
• Pilots and some professions: polarised lenses can make certain instrument displays hard to read.
• Price: polarised lenses usually cost more to make, so they tend to push the price up.

How can you tell if sunglasses are polarised?

Hold the sunglasses in front of a phone or computer screen and slowly tilt them 90 degrees. If the screen darkens noticeably at one angle, the lenses are polarised. With two pairs of polarised sunglasses, you can hold one lens in front of the other and rotate: at 90 degrees, they'll look almost black. The product description should also say so – if it doesn't mention polarisation, don't assume it.

What matters more than polarisation?

Whether you go polarised or not, three things decide how well a pair works in bright sun:

1. UV400 protection – non-negotiable.
2. The right category – category 3 for bright summer sun, category 2 for moderate light.
3. Coverage and fit – larger lenses and frames that sit close to the face let in less stray light. An oversized frame such as Bloch Black or Palazzo Havana covers more than a small, narrow one.

Choosing a pair for sunny days

Every ECO SHADES lens is made from recycled PMMA and listed as certified UV400. Browse frames in 100% recycled plastic in our recycled sunglasses collection – from the sporty Vork Green to classic shapes – or our plant-based acetate sunglasses, which are listed as category 3, for example the round Costa Blue. For active days by the water, the wrap-around Grosso Black Grey is built to stay put.

FAQ

Are polarized sunglasses better for driving?

Many drivers find them more comfortable, because they reduce glare from wet roads and other cars. Some dashboard and head-up displays can be harder to read, though. Never use category 4 lenses for driving.

Do polarised sunglasses protect against UV?

Only if the lenses also have a UV filter. Polarisation reduces glare; UV400 blocks UV. Check for both labels separately.

Is polarised the same as UV400?

No. UV400 is about invisible UV rays, polarisation is about visible glare. A lens can have one, both or neither.

Are polarised sunglasses worth the extra money?

If you often spend time near water, snow or glare-heavy roads, many people find them worth it. For city use, put your money into UV400, the right category and a frame that fits.