That entailed investing staff time, buying new glasses and changing menus, executive general manager Ayman Kamel said.

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And just as purchasing a pair of Toms shoes means that the company will donate a pair to someone in the developing world, buying a pair of sunglasses will guarantee prescription glasses or medical care for those in developing countries.

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One company that is buying into the 3-D-with-glasses trend is Sony, which makes movies and TVs to work with the technology.

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