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Originally Posted by grant hutchison
Doesn't UVA primarily damage the lens, because that's where it delivers its energy as it's absorbed? Hence the longterm use of bad sunglasses might increase your cataract risk, in the way you describe.
My recollection (which is admittedly hazy on this one) is that UVA damage to the retina is described only in people who have had their natural lenses removed by cataract surgery, which then allows the UVA all the way through to the back of the eye.
Grant Hutchison
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Scroll down to part IV regarding eye protection.
http://www.idph.state.ia.us/eh/commo...anninginfo.pdf
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The ether of general relativity therefore differs from that of classical mechanics or the special theory of relativity respectively, in so far as it is not 'absolute', but is determined in its locally variable properties by ponderable matter.
Albert Einstein, "On the Ether", 1924
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