While wave upon wave of smartglasses and face-based wearables crash on the shores of CES, traditional glasses really haven’t changed much over the hundreds of years we’ve been using them. The last innovation, arguably, was progressive multifocals that blended near and farsighted lenses — and that was back in the 1950s. It makes sense that autofocusing glasses maker IXI thinks it’s time to modernize glasses.
After recently announcing a 22-gram (0.7-ounce) prototype frame, the startup is here in Las Vegas to show off working prototypes of its lenses, a key component of its autofocus glasses, which could be a game-changer.
IXI’s glasses are designed for age-related farsightedness, a condition that affects many, if not most people over 45. They combine cameraless eye tracking with liquid crystal lenses that automatically activate when the glasses detect the user’s focus shifting. This means that, instead of having two separate prescriptions, as in multifocal or bifocal lenses, IXI’s lenses automatically switch between each prescription. Crucially — like most modern smartglasses — the frames themselves are lightweight and look like just another pair of normal glasses.
Mat Smith for Engadget
With a row of prototype frames and lenses laid out in front of him, CEO and co-founder Niko Eiden explained the technology, which can be separated into two parts. First, the IXI glasses track the movement of your eyes using a system of LEDs and photodiodes, dotted around the edges of where the lenses sit. The LEDs bounce invisible infrared light off the eyes and then measure the reflection, detecting the subtle movements of your eye and how both eyes converge when focusing on something close.
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Using infrared with just a "handful of analog channels" takes far less power than the millions of pixels and 60-times-per-second processing required by camera-based systems. IXI’s system not only tracks eye movements, but also blinking and gaze direction, while consuming only 4 milliwatts of power.
Mat Smith for Engadget
Most of the technology, including memory, sensors, driving electronics and eye tracker, is in the front frame of the glasses and part of the arms closest to the hinge. The IXI prototype apparently uses batteries similar in size to those found in AirPods, which gives some sense of the size and weight of the tech being used. The charging port is integrated into the glasses’ left arm hinge. Naturally, this does mean they can’t be worn while charging. IXI says that a single charge should cover a whole day’s usage.
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