When capacitive touch screens and multi-touch gestures first hit the mobile computing scene, they were a technological revelation. While existing point-and-click solutions work well enough in their own right, manipulating an on-screen cursor adds, by its very nature, a layer of abstraction to human-computer interactions. Direct finger-based manipulation, by contrast, is so intuitive that even a toddler can get the hang of it within just a few minutes.
Source : https://www.pocket-lint.com/how-to-use-eye-tracking-on-apple-iphone/
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