This article talks about the hardware required. My guess is that the front camera will be up to the task, with some clever software. Size of the image of the eye won't be a problem, because, although the front camera is only 2 megapixels, when the screen is being read, it's always within arms length.
http://www.dvice.com/2013-3-4/samsung-galaxy-s-iv-will-let-you-scroll-websites-your-eyes / New York City smartphone specifications features employee eye tracking software source track user’s eyes user scroll anonymity not authorized speak news media read articles reach bottom of the page software automatically scroll down reveal next paragraphs text company possible supplier Tobii smartphones 4.99-inch display 1920x 1080 resolution eight-core Samsung-built Exynos processor 2GB RAM 13-megapixel camera LED flash 1080p HD video recording two-megapixel front camera Android 4.2 Jelly Bean /
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