Choosing the right sunglasses: understanding UV indices

Why protect yourself from UV rays?

Ultraviolet rays (UV) from the sun are invisible but can cause significant damage to your eyes. Prolonged, unprotected exposure can lead to conditions such as photokératite (sunburn of the eye), cataracts, and even cancers of the eye and eyelids. Children, Older people and those with light eyes are particularly vulnerable.

UV indexes of sunglasses

Here are the main categories of UV protection indices to know:

• Indice UV 0 : absorbs between 0% and 20% of UV. Recommended only for indoor environments or very cloudy days.
• Indice UV 1 : absorbs between 20% and 57% of UV rays. Suitable for low sunlight.
• Indice UV 2 : absorbs between 57% and 82% of UV rays. Ideal for moderate sunlight.
• Indice UV 3 : absorbs between 82% and 92% of UV rays. Perfect for strong sunlight, typical of summer holidays.
• Indice UV 4 : absorbs between 92% and 97% of UV rays. Used for extreme light conditions, such as in high mountains or in mer. Not suitable for driving.

To choose your sunglasses well, it is essential to check several criteria:

• Protection UV : make sure the glasses block 100% UV-A and UV-B rays. This information is often indicated by a label or marking “UV400”, meaning that the glasses block rays up to a wavelength of 400 nanometers.
• Glass filtration category : depending on the intended use (city, sea, mountain), choose a suitable UV index.
• Safety standards : choose certified glasses CE (European Conformity), which guarantee a level of protection in accordance with European standards.
• Lens color : the color of the lenses does not determine UV protection but can influence visual comfortGray lenses maintain natural colors, brown lenses increase contrast, and yellow or orange lenses are ideal for low light.
• Shape of glasses : Prefer full-coverage glasses for better side protection. Wraparound or wide-arm frames provide superior coverage.

Choosing sunglasses isn’t just about style. Proper UV protection is crucial to maintaining the health of your eyes. By understanding UV indices and selecting the right sunglasses for your needs and environment, you can enjoy the sun safely.

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