Real time eye shader by Ella Svahn.
http://www.ellasvahn.com/eye-shader/
Real time rendering is evolving rapidly with next gen graphics platform and hardware. I have been digging around this subject lately and I think it could be the future for films and games alike as well as interactive walk-through. If you would like to explore the amazing world of shaders and realtime rendering you can shuffle around this blog: http://www.shaderfx.com/
Cheers 🙂