Julbo Sherpa are the mountaineering sunglasses that actually prevent snow blindness. We looked at Category 4 UV protection requirements and compared mineral glass to polycarbonate.
Who it's for
Buy this if: Mountaineers, glacier hikers, and anyone spending extended time on snow at altitude.
Skip this if: Forest and trail hikers — Category 4 is too dark for low-UV environments.
In practice
Snow Blindness Prevention
Snow reflects up to 80% of UV radiation — far exceeding what forest or trail conditions produce. Without Category 4 protection, 4-6 hours of snow exposure can cause photokeratitis (snow blindness): cornea sunburn producing 24-48 hours of pain and temporary vision loss. Category 4 reduces this risk to near zero.
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