you get what you pay for
I understand the reasoning behind cheap sunglasses.... if (and when) you drop them overboard, you're not out $150...but you get what you pay for. I've owned cheap (under $30) sunglasses and I own 2 pair of more expensive ($150 ) pairs and the echeap pairs do not even compare to the better made sunglasses. When you put on a good pair of shades that are 100% uv and glare resistant then put on a pair of cheap shades you will be able to tell.Currently I wear a pair of Kaenon's in hazy/low light conditions and a pair of Ullman regatta sunglasses in bright sunlight. The Kaenons are scratch resistant, spring loaded and fit like a glove.http://www.kaenon.com/product.cfm?action=show_product&product_id=578and the Ullman's are made out of brushed aluminum (lightwieght) and totally glare resistant. I can see a bug taking a crap while it is sitting on a breaking wave at mid-day with these on.Just be sure to keep your glasses clean, put croakies on them so you DO NOT lose them overboard and DO NOT sit on them.Sunglasses are as important a piece of equiptment as quality sails, foul weather gear, and good beer.