For years, polarized sunglasses have been used by boaters and fisherman to reduce glare from the water that they spend so much time on.

Perfect Sunglasses For Boating»

Light reflected from surfaces like a flat road or smooth water is generally horizontally polarized. This horizontally polarized light is blocked by the vertically oriented polarizers in the lenses. The result: a reduction in annoying and sometimes dangerous glare.


More information about polarized lenses


Polarized progressives are perfect for the farsighted person who is also an outdoor sports aficionado. And polarized photo chromic (that go from dark outside to light inside) lenses are right for the light-sensitive person who changes environments (inside to outside and vice versa) frequently. 
Sunglasses That Help With Polarization Problems»


The bottom line is that when you spend your time boating, polarized sunglasses are an excellent choice for sun wear.