Under sunglasses and a cloudy sky, Mike Zimmer addressed what the team called a "minor medical procedure" that led to a canceled press conference on Tuesday.

Zimmer, 60, underwent a procedure to fix a torn retina in his right eye after scratching it during the Vikings' 20-10 loss to the Bears on Monday night.

"First of all, I'd like to apologize for not being here yesterday," Zimmer said. "I had some trouble with my vision for a couple days, and during the game, I scratched on my eye. So, the doctors, after the game, they checked and had me get in for an appointment and I found out that I had a torn retina."

Two Edina-based opthalmologists, Dr. David Williams and Dr. Scott Sanderson, performed the procedure, Zimmer said. He was at the team's headquarters Tuesday afternoon and spent the night at Winter Park before offensive coordinator Norv Turner notified him of his resignation at 6:30 a.m.

"They said if you don't take care of those things that you have a possibility of going blind," Zimmer said. "So, that's why I wasn't here."

Film study has been a little different this week.

"I've been watching film with one eye all week or whatever it is," Zimmer said. "I've had to wear reading glasses, so I can write because I can't see out of my right eye. Fortunately, it's probably a good thing I scratched my eye during the game otherwise I probably wouldn't have caught it in time. But, hopefully everything will all right."