On top of purchasing a good pair of sunglass, consider using a quality strp to keep them connected to your face. PAL (Paul) posted back in June 2011
http://www.bigwatersedge.com/bwevb/s...ad.php?t=10439 (see post #9 on the thread) about Nexstraps. I use them a they are great. Here is a link to their website:
http://www.nexstraps.com/index.html
Also they have great customer service as part of teh end cracked and they replaced no problem.