Rick Heineman, a spokesman for RealD, which provides 3D equipment to cinemas, said headaches and nausea were the main reasons 3D technology never took off before.

为影院提供3D设备的RealD公司的发言人瑞克•海涅曼说，3D技术一直未兴起的主要原因就是它会让观影者感到头痛和恶心。

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You can help keep 3D green by dropping RealD 3D glasses into the collection bins located outside the theatre after the movie.

ENGADGET: RealD's smaller 3D glasses ensure your kids look a little less goofy in theaters

Kid-sized RealD 3D glasses are already available in select international markets.

ENGADGET: RealD's smaller 3D glasses ensure your kids look a little less goofy in theaters

"The little ones will be able to comfortably enjoy the great summer movies coming out in RealD 3D wearing glasses designed just for them, " said Joseph Peixoto, President of Worldwide Cinema at RealD.

ENGADGET: RealD's smaller 3D glasses ensure your kids look a little less goofy in theaters