From: david@edenroad.demon.co.uk   
      
   On Fri, 04 Feb 2005 12:08:03 +0100, Laura wrote:   
      
   >> Why?  Wouldn't the skine be more luminous?   
   >   
   > The lens of the eyeball would gather more photons into a small point. Well,   
   > at just the right distance from the eye, anyway.   
      
   I'm not sure how transparent the lens and cornea are to UV light; but even   
   so I don't think that a couple of square cm would outshine a square metre   
   or so of skin.   
      
   Not that it matters, of course :-)   
      
   Actually, I was thinking about this today, and I must admit to being   
   puzzled by it - IIRC a dark-adapted rod can detect about ten photons, so   
   why isn't it dazzled by the bio-optic light coming from the inside of the   
   eyeball?   
      
   > I just thought I'd give it a mention :-)   
      
   To tell the truth I'd forgotten all about it - I remember reading about   
   "mitogenic radiation" decades ago - I wasn't aware that it had moved   
   towards the mainstream.   
      
   PS.  Sorry about the typos in my earlier post.   
      
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