Anakin is seen only twice with yellow eyes in Revenge of the Sith, and I know it is a sign of fully embracing the dark side and hatred. Given we never see Vader's face until the end of Return of the Jedi, in which he is redeemed and has normal eyes, I was wondering if there were any canon or Legends pieces of evidence towards Vader's yellow eyes.
Yes, he did in both continuities.
In the Star Wars: Rebels episode Twilight of the Apprentice, Vader's helmet breaks and a yellow eye can be seen.
From Star Wars: Purge, a Legends comic:
From one of the Dark Horse Star Wars Legends comics:
He also seems to have yellow eyes in Star Wars: The Force Unleashed, though they're less obvious:
I don't believe there is any -canon- evidence to support him having yellow eyes. Not all individuals show outward signs of dark side corruption (Palpatine for example.) Given that Anakin did show signs of said corruption I believe it can safely be presumed that he had yellow eyes right up to the end of his life. It's also notable that many who returned to the LS or a neutral following of the force after obtaining dark side corruption characteristics never fully regained their normal appearance(EU.)