If Google Glass seems too normal, there's always AgencyGlass, which replaces your real eyes with computer-generated ones:
The glasses are the creation of Dr. Hirotaka Osawa, from Tsukuba University in Japan. They generate the fake, moving, and expressive eyes with software. As you can see, the inside of the glasses themselves is not transparent:
The video below explains that an external camera detects faces and motion of passersby, and an internal accelerometer detects head movement. The software then attempts to generate appropriate-looking eyes for the situation—even if the wearer's actual eyes are closed.
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