Apple Glass users' eyes can determine how engaged they are to the content they're viewing

for a system that can gauge how interested an Apple Glass wearer is in the content being displayed on the headset and can adjust the brightness of the display and even change the content. This is done by measuring whether the user's eyes are dilated or constricted while viewing certain content. The point of the technology in the patent application titled "Utilization Luminance Changes to Determine User Characteristics" is to "identify a state of a user (e.g., attentive, distracted, mind wandering, etc.) based on the user's physiological (e.g., pupillary) response to luminance change events ...

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