Stickers, Symbols and Sales Talk: How to Read a Pair of Sunglasses

Sunglasses labels are a bit like food packaging. They are designed to make you feel good about the purchase, but the useful information is often printed in small type on the inside of the temple arm. In 2026, the high street is full of fashionable frames with impressive-sounding claims, and it is easy to pay for style without checking whether the lenses are actually doing their job. The good news is that you do not need a science degree to sort the meaningful labels from the noise. You just need to know what a few key terms mean — and what they do not mean.

Start with UV, not darkness

The most important label is the one that tells you about ultraviolet protection. Look for UV400, which means the lenses block wavelengths up to 400 nanometres — the range that covers UVA and UVB. You may also see 100% UV protection or UV400 on a swing tag. That is the baseline you want. What you do not want is to assume that a dark lens is a protective lens. A very dark tint without a UV rating can actually be worse than no sunglasses at all, because it makes your pupils open wider while letting UV through. That is the classic mistake, and it is still worth checking for in 2026.

In the UK, sunglasses are not automatically tested to the same standard as safety eyewear, so the label is your main clue. Look for a clear UV400 claim and, where present, a reference to the relevant standard. A CE or UKCA mark can appear on some products, but do not treat a logo alone as proof of lens quality. The useful information is the UV claim, the category and the manufacturer details. If a pair has none of that, treat it as a fashion accessory rather than eye protection.

Category 3 is the British everyday hero

Lens categories run from 0 to 4, and they describe how much visible light the lens lets through. Category 0 is very light, category 1 is light, category 2 is medium, category 3 is dark, and category 4 is very dark. For most UK everyday use, category 3 is the sweet spot. It handles bright spring days, low winter sun and the kind of flat, glaring light you get on a motorway or a beach. Category 2 is useful for overcast days or people who prefer a lighter tint. Category 4 is for serious sun — think high altitude, glaciers or very bright water — and it is not suitable for driving.

That last point matters. If you want sunglasses for driving, look for a category 2 or 3 lens and check that the pair is described as suitable for driving. Very dark category 4 lenses can reduce your ability to see traffic lights, brake lights and hazards, especially in changing light. Polarised lenses can also affect the way some dashboard displays and phone screens look, so try before you commit if you spend a lot of time in the car.

Polarised is useful, not automatically better

Polarisation is one of the most misunderstood labels. A polarised lens has a filter that reduces glare from flat surfaces such as water, wet roads and car bonnets. That can be genuinely useful for driving, fishing, sailing or anyone who finds bright reflections tiring. But polarised does not mean more UV protection. It is a glare feature, not a UV rating. A polarised lens without UV400 is still not giving you the protection you need.

It is also not always the right choice. Some people find polarised lenses make it harder to read certain screens or see the texture of snow and ice. For ordinary city wear, a good non-polarised category 3 lens is perfectly adequate. If you are buying for a specific activity, match the lens to the job rather than paying extra for a word that sounds technical.

The claims that deserve a closer look

There are plenty of phrases that sound reassuring but tell you very little. 100% UV can be vague unless it specifies UVA and UVB or UV400. Anti-glare usually refers to a coating that reduces reflections on the back of the lens, which is nice but not a substitute for UV protection. HD vision and high-definition optics are marketing terms without a fixed meaning. Blue-light filtering is not the same as UV protection, and it is not a reason to choose a pair for sun protection. Scratch-resistant is not scratch-proof. None of these are necessarily bad, but they should not distract you from the basics.

Another myth is that expensive sunglasses are always safer. Price tends to buy you better frame materials, nicer hinges, more consistent lens quality and design. It does not guarantee UV protection. A well-labelled pair at a modest price can be perfectly protective, and an expensive pair with no UV claim is still a poor choice for your eyes. The reverse is also true: a cheap pair with a clear UV400 label and a category 3 lens can do the basic job well.

A quick checklist before you pay

Use this as a practical filter in the shop or when shopping online:

• Check for UV400 or a clear 100% UVA and UVB claim.
• Confirm the lens category. Category 3 is the best all-rounder for UK light; category 2 is good for softer days.
• If you are driving, choose category 2 or 3 and check the driving suitability note. Avoid category 4.
• Treat polarisation as a glare-reduction feature, not a UV guarantee.
• Look for a returns policy. Fit and comfort matter, and you cannot judge either from a product photo.
• Try the frame with your usual coat, hat and hairstyle. A label cannot tell you whether it suits your face.

The fit is part of the protection

A pair that slips down your nose or sits too far from your eyes will let light in around the edges, and it will be annoying enough that you stop wearing it. Bridge width and temple length are worth checking, especially if you are buying online. The frame should sit comfortably without pinching, and the lenses should cover the eye area without touching your lashes. If you need prescription lenses, ask about UV protection and lens category at the point of order; do not assume that all prescription sunglasses are created equal.

In 2026, the best pair is not the one with the longest list of buzzwords. It is the one with a clear UV claim, a sensible category for British light, a comfortable fit and a look you will actually wear. Read the small print, ignore the theatre, and buy the pair that does both jobs.