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Sunglasses - light transmission & CE Categories

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 stewieatb 30 May 2011
Hey chaps

I'm after some sunglasses for use in the alps, but also for road cycling. I wear prescription glasses (short-sighted) full time, which severely complicates things.

What I'm trying to figure out is how the CE Categories (Cat3/Cat4 lenses) relate to the light transmission percentages typically given for cycling lenses. There are glasses by 720 Armour available on Chain Reaction that will take prescription lenses in a holder, but only transmission percentages are given. How would, say, 10-18% transmission relate to the CE categories? Maybe Cat 3?
 stevev 30 May 2011
In reply to stewieatb: http://www.needlesports.com/Catalogue/Accessories/Glacier-Glasses-Goggles

1 43% - 80% visible light transmitted. Suitable for use in cloudy conditions with virtually no direct sunlight eg blizzards and whiteouts.
2 18% - 43% visible light transmitted. Suitable for use as general sunglasses and in cloudy conditions in the mountains, but not direct sunlight in mountain areas where there will be a lot of reflection off snow and ice.
3 8% - 18% visible light transmitted. Suitable for Alpine and Himalayan mountaineering for most uses, but for prolonged exposure at high altitude Category 4 is recommended.
4 3% - 8% visible light transmitted. For prolonged exposure at high altitude. Will be found too dark for everyday use and should not be used whilst driving a car.
OP stewieatb 30 May 2011
In reply to stevev:

Aaahhh. Brilliant, cheers

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