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I did a very simplistic test of this. I did not implement a software solution. Rather, I simply captured a video of myself gazing, for a few seconds at a time, at each corner of the screen of an iPad 2. I cropped the video to my eyes only, and examined it manually. Using the pupil and "screen glint", I could very easily determine which corner I had been ...


The iPad Air 2's front camera has 1.2MP resolution, or 1280x960 pixels. Let's make some assumptions: The horizontal field of view is 60° Users hold their tablets about 450mm from their eyes Eyeballs are about 24mm in diameter So, at the distance of a user's eyeball, one pixel covers (450mm * tan(60 / 1280))mm = 0.37mm. Let's see how much an eyeball ...

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