It's tracking head movement, not eye movement. It won't be able to tell which portion of the screen you're looking at - just where your head is in relation to the screen. They're two entirely different things, and serve two entirely different functions.
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Head movement
It's tracking head movement, not eye movement. It won't be able to tell which portion of the screen you're looking at - just where your head is in relation to the screen. They're two entirely different things, and serve two entirely different functions.