I noticed there's no evolution like All Around Vision or Uncanny Dodge for Eidolon's, which was something brought up when the Eidolon in question has multiple eyes all around it's body (as part of it's cosmetic look, as it's more of an aberration) and keeps on getting flanked and sneak attacked.
While it's fair that it gets sneak attacked based on the points I invested, I realize that there's no evolution that matches the concept of having multiple eyes. I'm guessing if there was one it would be a 1 or 2 point evolution.