Comment: Re:Cool (Score 2) 310
No, think you are very wrong on that. What is the point of UV blocking sunglasses then if our eye lens would block out UV light naturally?
Because neither set of lenses blocks it perfectly. This is typical of filters.
It's a lot like some lethally poisonous delicious mushrooms. The poison is unaffected by cooking, so you should soak the mushrooms in water first. After you've done that you should do it a second time. This process doesn't remove the poison - it only removes something like 90% (per soaking) of it IIRC. Then you eat the poisonous mushrooms, and they're delicious.
In the same way the 10% (I just made up that number for the point) of UV that gets past your own lens is still bad. 1% or even less that gets past shades and your eye is much better. Shades are only needed occasionally because the difference in solar UV probably varies by several orders of magnitude.