Netyaroze said:
You could program an engine that gives the illusion of focus if the eyes are directed at a certain object. it will just render whatever you look the correct way. Depending on how much your eyes focus. Its a trick but did you ever see it in a working system ? If not you can not dismiss the possibility of it being good enough one day to fool us.
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It's about distance. We say things are in focus when light rays converge on the retina with a certain amount of clarity. But distance changes the point of convergance. Lenses adjust for this by changing shape. (Or in the case of mechanical optics, changing the distance between a stack of lenses.)
Light from a flat plane will always have the same distance, and lenses will never have to change shape. (The illusion of depth on stereoscopic 3D is more phsycological than physical.)
http://en.wikipedia.org/wiki/Accommodation_%28eye%29







