The human eye is all backward. The octopus eye is much less imperfect since the light receptors are on the pupil side of the retina, there’s no blind spot, and there’s no intervening bipolar layer.

Other examples:

  • Wisdom teeth too big for the adult jaw
  • An appendix that can flare up and kill you
  • Cave fish have eyes, but are totally blind
  • And then there’s this guy
  • Or this one
  • Or this
  • And this!