Do Zoro, Nami and Robin suffer from bad eyesight?


Although I never noticed in the main story of the anime, there are scenes in
some of the openings where Zoro, Nami and Robin are shown wearing eyeglasses:

  * [Zoro in opening 11](http://youtu.be/tIPp1Zhg2gU?t=33s)
  * [Robin in opening 13](http://youtu.be/ntoB59VttFU?t=55s)
  * [Nami in opening 16](http://youtu.be/3wSvrBxzX4o?t=26s)

Is the fact that they all have bad eyesight canon? Or is it just some filler
that the author probably wanted to mix into the series?




Considering they don't wear glasses normally or even while reading, it's fair
to say that their eyesight is just fine. They simply like to wear those
glasses from time to time for the sake of appearance. Even Sanji wore glasses
for a moment in One Piece Film Z, for that same reason.

