Smart glasses use sonar to work out where you’re looking

The Gazetrak smart glasses track eye movements with reflected sound

Courtesy of Cheng Zhan

Prototype smart glasses can track people’s eye movements using a technique similar to sonar, an approach that uses 95 per cent less power than other methods.

Virtual reality headsets like Apple Vision Pro  and Meta Quest Pro use cameras pointing towards the wearer’s face to track their eye movement. This offers high accuracy, typically estimating the angle of their gaze to within 1 degree, but also consumes a lot of power.


Ke Li at Cornell University in New York and…

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