DW> He said he didn't like them, and wouldn't use them himself. The glass
 DW> ones, which are still obtainable here, have to be thick and heavy.
 DW> The plastic ones depend on ultraviolet light to darken them, so they
 DW> won't work, for example, in a car, since the glass of the windshield
 DW> and windows filters out the UV.

Beyond that, what's most important in any sunglasses is their
ability to absorb UV.  Sunglasses that don't do that just widen
your pupils and let more UV in.  IMO it's safer to get a separate
pair of sunglasses designed to do just that.

Paul Rogers, paulgrogers{at}yahoo.com                       -o)
http://www.angelfire.com/or/paulrogers                   /\\
Rogers' Second Law: Everything you do communicates.     _\_V

... The cat is a creature of absolute convictions.
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