Personally I wouldn't wear a lexan mask unless either 1. I had to or 2. someone paid me a lot of money to wear one. I've heard enough horror stories about them failing under stress to put me off.
If the idea was to improve fencing as spectacle or make it more television friendly then coloured masks are proabaly the way to go. Check this one out.
http://www.leonpaul.com/news/team_s/la_halst.htm
If you've got your choice of mask design it will probably be more fun for spectators than trying to see through a bit of plastic mask and trying to work out what is going through a fencer's tiny pea-brain.
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