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UV400 protection and CAT sun filters: A complete guide to choosing your sunglasses

When it comes to quality sunglasses, it's not just the design that matters. Eye protection is key, which is why terms like UV400 or CAT.3 sun protection appear. If you're not sure what they mean, we'll explain it in a simple way here.

What is UV400 protection? ☼

Sunglasses with UV400 protection block 100% of ultraviolet rays (UVA and UVB) up to 400 nanometers. This feature is essential to prevent long-term problems such as cataracts, eye degeneration, or irritation caused by sun exposure.

In short, choosing UV400 sunglasses means maximum safety from the sun's radiation, without sacrificing comfort or style.

What are sunscreen categories (STCs)?

In addition to UV protection, lenses are classified into filter categories that indicate how much visible light they allow through. These categories range from 0 to 4:

• CAT. 0 - Nearly transparent lenses. For indoor or night use.
• CAT. 1 - Light. Ideal for cloudy days or soft light.
• CAT. 2 - Medium filter. Recommended for moderately sunny days.
• CAT. 3 - High filter. These are the most common sunglasses for everyday use, perfect for the beach, mountains, or driving in bright sunlight.
• CAT. 4 - Very high filter. Used in extreme conditions such as glaciers or high mountains. Not suitable for driving.

Which one to choose for everyday use?

For most people, the ideal option is UV400 + CAT.3 filter:

• They block 100% of ultraviolet rays.
• They offer a perfect level of blackout for sunny days.
• They are safe and comfortable for daily activities such as walking, driving or outdoor sports.

Conclusion ㋡

When purchasing sunglasses, always consider two key aspects: UV400 protection and a filter category adapted to your use. If you're looking for safety, comfort, and versatility, choose sunglasses with UV400 and CAT.3, the most balanced combination for your everyday wear.