The technology to reproduce eye movements has been around since motion pictures were invented. I'm sure even a flat video stream of the user's face would leak similar information.
Apple should have been more careful about allowing any eye motion information (including simple video) to flow out of a system where eye movements themselves are used for data input.
Apple should have been more careful about allowing any eye motion information (including simple video) to flow out of a system where eye movements themselves are used for data input.