As Al Pacino observes in Scarface: “The eyes, chico, they never lie.” Little wonder, then, that data-hungry Silicon Valley wants to train sensors on our peepers. Eye-tracking cameras, small enough to sit inside a pair of goggles, can detect minute changes in pupil dilation, direction of gaze and focus.

If a new generation of virtual reality (VR) headsets and smart glasses takes off, millions of us could soon be wearing them.

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