Stephen Balaban has re-engineered his Google Glass to allow for facial recognition. Courtesy of Stephen Balaban hide caption

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Filmmaker Chris Barrett wearing his Google Glass. He is among the first 1,000 nondeveloper testers of the product. Jennifer Rubinovitz/Courtesy of Chris Barrett hide caption

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A visitor at the "NEXT Berlin" conference tries out Google Glass on April 24 in Berlin. AFP/Getty Images hide caption

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Google co-founder Sergey Brin wears Google Glass glasses at an event on the University of California, San Francisco's Mission Bay campus on Feb. 20. Jeff Chiu/AP hide caption

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