Did you know that more than half of U.S. men and women misplace, or break, their sunglasses, and a designer pair costs an average of $150 to $300? Sunglasses are hardly unbreakable. Lenses get scratched, and sometimes even crack. Instead of replacing the whole kit and kaboodle, though, more consumers are saving money, and focusing, instead, on what exactly needs replacing. What should you think about when you pick out sunglasses? What Kinds of Lenses Do You Have? Did you know that as many as 40% of Americans wear sunglasses for medical reasons? Your lenses should block out 100% of…