Osteo-odonto-keratoprosthesis, also known as "tooth in eye" surgery, is a medical procedure to restore vision in the most severe cases of corneal and ocular surface patients. It includes removal of a tooth from the patient or a donor. From Wikipedia
Surgeons used osteoodonto-keratoprosthesis, placing a lens inside one of his teeth and later implanting it in the eye when conventional corneal options were not viable.