Sunglasses Buying Guide: UV Protection, Lenses & Fit

Cheap sunglasses can be worse than wearing none. Dark lenses without UV protection dilate your pupils, letting more harmful rays in. Here is what to look for.

UV protection: the only non-negotiable

Look for UV400 or 100% UV protection. This blocks wavelengths up to 400 nanometres, covering UVA and UVB. If the label does not say it explicitly, assume it does not have it.

CE marking is the UK/EU standard. Category 3 for general use, Category 4 for intense glare (not suitable for driving).

Polarised vs. non-polarised

Polarised lenses cut glare from water, wet roads, and car bonnets. They make driving safer and reduce eye strain. The trade-off: LCD screens may appear dim at certain angles.

For everyday use, polarised is worth the upgrade. For watersports and driving, it is essential.

Lens colour matters

Grey lenses reduce brightness without distorting colours. Best for driving. Brown and amber increase contrast. Ideal for sports. Yellow enhances depth perception in low light.

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Frequently asked questions

Are expensive sunglasses worth it?

Up to £100-150, you pay for better lenses and guaranteed UV protection. Above that, brand name. £40-80 gets excellent protection with the right specs.

How do I check UV protection?

Look for UV400 or CE mark. Most opticians test for free.

Can I wear polarised for driving?

Yes. They cut dashboard and road glare significantly.

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