To make them larger a company called SeeReal, based in Luxembourg, has built systems that use two eye-tracking cameras above a large 3-d display to follow the viewer's eyes.

卢森堡的SeeReal公司采取了这样的系统：将两个摄像机架在大型3d显示器上面，追踪观众的眼球活动。

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Eye-tracking systems are fixed into screens to gather data so the images can be personalised.

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Overlooked by FIFA for those tournaments, Hawk-Eye -- which already provides ball-tracking systems for tennis and cricket -- will install its technology in 20 Premier League grounds and at Wembley, which will host August's Community Shield.

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