Advantage or Handicap?

[Marta Prime]

I asked this question in reponse to a conversation that was going around a portrait critique, however, prompting from a friend suggested I post it here as it might get lost where it is.

Do you think that a person with only one eye would have a perspective advantage in painting, or a handicap? I know William Whitaker talked about having really bad vision in one eye, yet his paintings are beautiful. I think there was a Master or two with really bad vision too...but don't recall which. What do you think? Maybe I should have made this a poll...advantage or disadvantage?