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Safe in the sun: UV-protection and filter categories for sunglasses

For many people, sunglasses are a fashion accessory that give their look a sheen of cool through spring and summer. In winter, too, to prevent the eyes being dazzled by snow or the intense light of cold, sunny days, shades have their use.

However, not everyone knows that sunglasses have an important purpose beyond their fashion aspect: the lenses protect the eyes from harmful UV-radiation. This is an issue not only under blue skies, but also on cloudy days. All sunglasses should therefore offer both anti-glare and UV-protection.

Optimal vision thanks to anti-glare protection: the filter categories

One reason we wear sunglasses is so as not to have to use a hand to shield our eyes from sunlight. The lenses absorb the visible light aimed at the eyes. The darker the lenses, the higher the protection. The levels of protection are divided up into so-called filter categories.

Filter categories
Filter categories

Note: All sunglasses available at Mister Spex are fitted with filter category 3 lenses

Healthy eyes thanks to UV protection

In addition to visible light, the sun also sends invisible rays to the Earth. While UV-C rays are absorbed by the Earth’s atmosphere, UV-B and UV-A rays penetrate the atmosphere and reach the Earth’s surface. Even in the shade or in cloudy conditions the exposure level can be as high as 90 percent. Particular caution is urged at the sea or in mountainous areas: bright sand, water and snow reflect sunlight and heighten its effect by up to 70 percent.

UV radiation
UV radiation

Anyone who has ever suffered from sunburn knows how strong the effect of UV radiation can be. When it comes to the eyes, UV-rays can lead to problems such as conjunctivitis, corneal inflammation and in the long-term possibly even cataracts. Sunglasses with guaranteed UV-protection are therefore essential for the health of your eyes, whatever the weather and surroundings. If the sunglasses are certified as UV 400, it means they filter UV-rays with a wavelength of up to 400 nanometres, thus protecting you from both UV-A and UV-B rays.

Warning: Sunglasses with dark lenses but no UV-protection are more dangerous than you might think. The lenses shield the eyes from visible light, which means the pupils distend more. However, the UV-rays still get through to the eyes. The result is that a larger proportion of harmful light reaches the distended pupils.

On the safe side – the key features of quality sunglasses

  • Sunglass lenses should have no streaks, air bubbles or inclusions and should resist rather than yield to light finger pressure

  • Lenses with a fully anti-reflective coating minimise reflections that may be caused by light entering from above or the sides and hitting the back surfaces of your lenses.

  • Alongside lens quality, frame design is also important. It is often falsely assumed that sunlight only hits the front of the glasses. However, stray light can come from above or the sides and get behind the lenses. Sufficiently large temples and a frame that is the right size for your face are therefore also important. Ideally, the sunglasses should be slightly broader than your face and a little higher than the eyebrows.

  • An important indicator of quality is the CE-label, which every pair of sunglasses sold in Europe has to carry. It’s situated on the inner side of the temples and is evidence that the sunglasses correspond to EU standards.

Tip: It’s quite easy to create a fake CE-label. So if you want to be absolutely sure that your sunglasses offer the necessary protection, it can be a good idea to get your optician to test them.


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