-> 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. 
  
Yes. But almost all common glass and plastic lenses, even if they look 
very clear in visible light, are strong absorbers of UV. There are 
several advantages to having to wear eyeglasses. One is that they can 
protect against bits of grit or other material that could get into the 
eyes. Another is that, even if you are unaware of it, they 
substantially reduce your eyes' exposure to UV, and therefore the risk 
of developing cataracts, and so on. Sunglasses that are specifically 
designed to protect against UV do a better job, but not greatly so. 
  
Contact lenses are also protective. Having your vision corrected by 
laser surgery destroys the benefits that glasses or contacts provide. 
  
                           dow 
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