Eye tracking has long meant expensive hardware, infrared sensors, and controlled setups. That may not last, as a new smart contact lens system aims to deliver precise tracking using cameras you already use every day.
XPANCEO is developing a passive design that embeds microscopic patterns into contact lenses, turning them into optical markers readable by built-in cameras across laptops, phones, cars, and helmets. The shift is straightforward. You don’t need extra hardware or power to make it work.
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Instead of active electronics, the lens relies on nano-patterns that move with your eye. External cameras detect those shifts and translate them into gaze direction, with reported accuracy around 0.3 degrees.
How the passive tracking actually works
Each lens contains two ultra-thin optical gratings separated by a microscopic gap. As your eye rotates, the layers shift and create changing moiré patterns that cameras can detect and interpret.
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