Osteo-odonto-keratoprosthesis - surgery that uses a patient's own tooth grafted into their eye

"I will graft your tooth into your eye" would've been a good contender in the unsettling threats thread

Surg tech with about 8 years experience - never heard of this one. Some of the shit we do...

Anyway, image search at your own risk. Here's the least nightmare-fuel image I could find:

...so we basically use tooth tissue to replace the iris? Seems like something we could just use a specialized contact lens for, without needing to graft an actual biologic... then again, maybe that's why I've never heard of it :P