{"id":2157,"date":"2026-08-01T17:58:35","date_gmt":"2026-08-01T17:58:35","guid":{"rendered":"https:\/\/matterseyewear.com\/?p=2157"},"modified":"2026-08-01T18:02:58","modified_gmt":"2026-08-01T18:02:58","slug":"what-does-uv400-sunglasses-mean","status":"publish","type":"post","link":"https:\/\/matterseyewear.com\/en\/what-does-uv400-sunglasses-mean\/","title":{"rendered":"What does UV400 mean on sunglasses?"},"content":{"rendered":"

The label on sunglasses may contain several words: polarized, category 3, UV400, gradient lenses, or ultraviolet protection.<\/span><\/p>\n

Although they are often listed together, they do not describe the same property. Understanding what UV400 means helps distinguish radiation protection from simply the dark color of the lens.<\/span><\/p>\n

The number 400 refers to nanometers.<\/b><\/h2>\n

Ultraviolet radiation is outside the visible range of the human eye. The term UV400 indicates that the lens is designed to filter ultraviolet radiation down to a wavelength of 400 nanometers.<\/span><\/p>\n

This limit covers the UVA and UVB regions relevant to eye protection. That's why you might also see a label like \u201c100 % UVA and UVB\u201d.<\/span><\/p>\n

The American Academy of Ophthalmology recommends choosing glasses that block 99 or 100% of UVA and UVB radiation.<\/span><\/p>\n

A very dark lens does not necessarily offer more protection.<\/b><\/h2>\n

The darkness indicates how much visible light the lens lets through. It does not, on its own, indicate the amount of ultraviolet radiation it filters.<\/span><\/p>\n

A clear lens can provide good UV protection. A very dark lens, if it doesn't meet the necessary specifications, can filter out a lot of visible light and allow ultraviolet radiation to pass through.<\/span><\/p>\n

That's why it's not advisable to judge sunglasses solely by their color. RNIB reminds us that lens darkness does not determine UV protection.<\/span><\/p>\n

UV400 does not mean polarization either<\/b><\/h2>\n

Polarization reduces certain reflections from water, pavement, or shiny surfaces. UV protection acts on a non-visible part of the radiation.<\/span><\/p>\n

These are complementary but independent features. A lens can incorporate one, both, or neither.<\/span><\/p>\n

What is its relationship to the category?<\/b><\/h2>\n

Categories 0 through 4 classify the amount of visible light that passes through a lens.<\/span><\/p>\n

A higher category means a darker lens, but not necessarily superior UV protection. All compliant sunglasses should provide the stated level of ultraviolet protection, regardless of whether they are category 1, 2, or 3.<\/span><\/p>\n

Therefore, a complete description could include:<\/span><\/p>\n

    \n
  • UV400:<\/b> ultraviolet protection.<\/span><\/li>\n
  • Category 3:<\/b> high reduction of visible light.<\/span><\/li>\n
  • Polarized:<\/b> reduction of reflexes.<\/span><\/li>\n<\/ul>\n

    Matters sunglasses combine these three characteristics.<\/span><\/p>\n

    How to check protection when buying<\/b><\/h2>\n

    Look for clear information on the product, labeling, or documentation:<\/span><\/p>\n

      \n
    • UV400 or 100 % UVA\/UVB indication.<\/span><\/li>\n
    • Filter category.<\/span><\/li>\n
    • Identification of the manufacturer or importer.<\/span><\/li>\n
    • CE marking where applicable.<\/span><\/li>\n
    • Usage warnings, especially for driving.<\/span><\/li>\n
    • Information on the applicable standard.<\/span><\/li>\n<\/ul>\n

       <\/p>\n

      In the European Union, the CE marking indicates that the manufacturer declares that the product complies with the relevant legal requirements. It is not simply a decorative element of the packaging.<\/p>\n

      Home tests using screens or flashlights do not reliably verify ultraviolet filtering. Specific equipment is needed to test old glasses or glasses without clear information.<\/span><\/p>\n

      Shape and fit also play a role.<\/b><\/h2>\n

      A lens can provide adequate frontal protection while still allowing light in from the sides. Large, tight-fitting, or wraparound frames reduce side exposure.<\/span><\/p>\n

      It is also advisable to combine glasses with other items, such as hats or visors, especially during prolonged exposures.<\/span><\/p>\n

      Are they only necessary in summer?<\/b><\/h2>\n

      No. Ultraviolet radiation is present year-round and can be reflected by water, sand, or snow. Cloudy days don't completely eliminate exposure either.<\/span><\/p>\n

      The choice should depend on the environment, the light and the time you will spend outdoors, not just the season.<\/span><\/p>\n

      UV400 does not describe the style or color of sunglasses. It describes a protective function that should be checked before considering any other details.<\/span><\/p>","protected":false},"excerpt":{"rendered":"

      Several words may appear on the label of sunglasses: polarized, category 3, UV400, gradient lenses, or ultraviolet protection. Although they are often listed together, they don't describe the same property. Understanding what UV400 means helps distinguish radiation protection from simply a dark lens color. The number 400 refers to [\u2026]<\/p>","protected":false},"author":1,"featured_media":2159,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2157","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\n\u00bfQu\u00e9 significa UV400 en unas gafas de sol?<\/title>\n<meta name=\"description\" content=\"UV400, polarizaci\u00f3n y oscuridad no son lo mismo. 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