Inside something patent called “Gaze-Dependent Screen Encryption,” issued on May 4 and noticed Apple Insider, Apple has developed a detailed system that allows the iPhone or iPad to follow your eyes so that it can see exactly what part of the document you are viewing.
These sections would remain legible, but the device covered all the parts you are not actively reading.
However, this system does not simply clear other text, but one suggested way is to arrange or change the letters, so the words become confusing. This makes it more difficult for observers to determine which part of the screen is readable than if the rest were simply obscured or similar.
The system would bite the text as the user reads, while shuffling the bits from which their eyes have moved, and in theory it should create a seamless reading experience for the intended viewer and very challenging for everyone else.
Of course, for this system to work, it needs very close gaze tracking, probably beyond what Apple’s current devices can do.
But with its facial recognition system, the company is probably much closer to the ability to pull something like this out of most competitors, so we’re not surprised if we see it one day. Don’t just trust you to see it iPhone 13.