The Oscar winner told Entertainment Tonight that she wants to be honest about the surgery because she is currently writing about a book on ageing.
"I recently had plastic surgery. It was a hard decision to make, and I decided if I'm going to do it, I'm going to tell the truth," she said. "'I'm writing a book about ageing, so I can't write that book and not say I've had plastic surgery."
She continued: "And you know, I just decided it was for me... I don't want to have bags under my eyes that make me look tired, and so forth and so on."
Fonda also discussed her life-long passion for exercising and acknowledged that she plans to cut down on strenuous workouts as she gets older.
"I have, in my life, been obsessive about exercise, about most everything. But one of the good things that happens when you get older is everything comes into perspective. I don't want to get hurt," the star explained.
