The Undertaker recently appeared on Hawk & Wolf to discuss a match he had with Mabel (Viscera) back in 1995, during which his orbital bone was crushed so badly he was forced to wear a mask to protect his face from further damage. The WWE Hall of Famer revealed the injury was further made worse many years later when Rey Mysterio dived on to him. 

On suffering the orbital injury vs. Mabel back in 1995:

"The doctor goes, ‘you’ve lost about 50 percent of your orbital floor.’ ‘Excuse me?’ ‘You need to go home and find an ophthalmologist and a surgeon.’ Come to find out, I ended up losing 90% of my orbital floor. My optic nerve is setting on a jagged piece of bone. If I got hit on the right side of my head again, there is a good chance I would have lost my eye. Took two surgeons, they go in, take out all the bone fragments, and they put in a fake one."

On how the injury was made worse during a spot with Rey Mysterio:

"Rey Mysterio, tiny guy, sweetheart of a guy, he ended up jumping off the top rope, and his ass was supposed to hit me in the chest, but it hit me right in the face. It was a bony ass. Bony ass, right on the bridge of my nose. He lands, I have all of his weight on my head, I hit the mat and blew out the other one. I broke my nose and I was concussed. It’s hard being injured by an anus. My nose was broke, I fixed my nose right there, I just squeezed my nose back.The second one, to this day and it’s probably been 15 years, I still have double vision."