I did a little experimentation and found that a 10x Bausch & Lomb jewler's loupe seems to have the right optical properties. Just fasten 2 loupes to some clear swim goggles, drill some holes the side of the loupe to let the water in and there you go. The goggles can be filled with some nice, clean saline solution or whatever your eyes prefer to swim in.
Surplus loupes can be purchased for under $5 each.
I think I'll stick with a mask, but I plan to start carrying a loupe as a back-up in case my mask gets flooded, knocked loose etc.
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