"Men seldom make passes at girls who wear glasses."

So goes the old saying, but the sexy librarian look does have its fans, and so too do flasses. Don't know flasses?

According to the urban dictionary, the definition of flasses is as follows: Glasses that do not contain prescribed lenses, worn by women who want to look sophisticated or cop out of putting on make-up/doing hair.

They're all the rage this season, especially with twenty-somethings who want to add a little sophisticated intellectual air to their image.

See if you can weed out the flasses from the glasses.

Now what about you...would you wear this latest trend in eyewear? If you're interested, you can buy most any frame at your local optician without prescription lenses. For a cheaper alternative, check out these readers guaranteed to improve your looks, if not your eyesight from urban outfitters.