Rob McNichol lost his sight in a work-place accident, when liquid aluminum exploded in his face several years ago. But now, thanks to his son's tooth, he can see again. Here's the story of a strange medical procedure called the Osteo Odonto Kerato Prosthesis:
The surgery, Osteo Odonto Kerato Prosthesis (OOKP), involved fitting a living canine tooth with an optical cylinder and transplanting it into the eye cavity. [...]
"It doesn't look that great to be honest. People think I look like the Terminator but I don't care. The looks end of it are cosmetic and they don't matter.
"What is incredible is that I have come out of darkness into light again. I can watch television. I can walk down the street on my own. I can play darts and pool. I can see my wife and kids. It is just unbelievable".
Link - Thanks Rob!