Instead, they signal their membership in the elite another way — with expensive sneakers and luxury eyewear. The sunglasses of Silicon Valley are taken out of their cases at least once a year ...

"Most of the standards protect us up to 380 ... "There can be some quite expensive sunglasses that don’t conform, and likewise some relatively inexpensive ones that do," says James.

Not exactly known for having a highbrow taste in fashion, Zuckerberg stays true to form with perhaps the most classic pair of sunglasses on the market: Ray-Ban's Original Wayfarers. Apple's design ...