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Neil Blumenthal, founder of Warby Parker, explains how his company grew 500 percent in one year and beat its yearly sales projections in three weeks. Warby Parker, a fashionable eyeglass company based in New York City, has seen some explosive growth in the last year. The company launched in 2010.

"I wanted to make something bigger than myself," says Mitchell. Frustration can be a great motivator.

Neil Blumenthal and David Gilboa, two founders of Warby Parker, explain how they dramatically undercut the dominant glasses makers. They position their $95 vintage-inspired frames like women's fashion accessories--not just to be sold when a prescription runs out.