UV-400 vs Polarized Sunglasses: What's the Difference (and Why You Need Both)

Two Separate Lens Technologies, Often Confused

UV-400 and polarization are two distinct features in sunglass lenses, and many shoppers confuse them. They solve different problems and the best sunglasses include both. Understanding the difference helps you avoid the cheap UV-blocking-only frames or the expensive polarized-but-not-UV-rated frames that exist in the market.

UV-400 — Eye Health Protection

UV-400 is a rating, not a coating. It means the lens material blocks 100% of ultraviolet radiation up to 400 nanometers. This includes both UV-A (which penetrates deeper into the eye and is linked to cataracts and macular degeneration over decades) and UV-B (which causes acute eye sunburn — photokeratitis — and is linked to skin cancer on the eyelid).

UV-400 is about long-term eye health. The damage is cumulative and largely invisible in the short term — but eye care professionals consistently recommend daily UV protection from age 18 onward.

Polarization — Glare Reduction

Polarization is a filter applied to the lens that blocks horizontally-polarized light waves. When sunlight reflects off horizontal surfaces — water, snow, wet roads, car hoods — the reflected light becomes horizontally polarized and creates intense glare. A polarized lens filters out this specific wavelength orientation while letting other light pass through.

The benefit is functional rather than health-protective: you can see through water surfaces (useful for fishing, driving wet roads, looking at snow trails), and glare-induced eye strain decreases significantly.

Why You Want Both

UV-400 alone protects your eyes from invisible damage. Polarization alone makes daytime driving and outdoor activity more comfortable without protecting from UV. OHO's combines both technologies across all six silhouette models — meaning whichever frame style you prefer, you're getting full UV protection AND glare reduction.