I saw a prototype of this technology in 2013 – its awesome! Add glasses free 3D viewing to your Apple iPad:

Leveraging many years of 3D industry experience, Ooyavah has created a glasses-free 3D viewing solution for the world’s most popular tablet – the Apple iPad. 

from Ooyavah. The product itself is named Pryzma.
Click here to learn how it works.
It combines a state of the art lenticular lens overlay, on the Apple iPad screen, with use of the iPad’s camera to track your eyes in real time, automatically adjusting the screen’s content to deliver true and accurate glasses free 3D viewing your left and right eyes.