Polarized vs UV400 Sunglasses: What's the Difference?
"Polarized" and "UV400" both sound like good things — and they are. But they protect your eyes in completely different ways. Here's the simple breakdown.
UV400: Protection From the Sun's Rays
UV400 is about safety. It means the lenses block 100% of ultraviolet light up to 400 nanometers — both UVA and UVB. This protects your eyes from long-term damage like cataracts and macular degeneration. Every pair of quality sunglasses should have UV400 protection, regardless of tint or style.
Polarized: Protection From Glare
Polarization is about comfort. A special filter blocks horizontal light waves — the kind that bounce off water, snow, wet roads, and car hoods. The result is a dramatic reduction in glare and clearer, more vivid vision. Polarized lenses don't necessarily block more UV; they're an added comfort feature.
Which Do You Need?
- Everyday sun protection: UV400 is non-negotiable.
- Driving, water, snow, bright conditions: add polarized for comfort.
- Best of both: look for sunglasses that offer UV400 and polarization.
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