why do we have eyes? and not use some other method

Question: why do we have eyes? and not use some other method
- Keywords:
  eye,
  light,
  receptor,
  senses,
  vision,
  visual
Asked by diamondpwh to Helen, Jenni, Mark, Martin, Stu on 21 Jun 2011.
- Jenni Tilley answered on 21 Jun 2011:
  
  Because that’s what we’ve evolved with. If we went back to the beginning, who’s to say something else wouldn’t develop instead. Maybe humans would have sonar like bats?

Question: why do we have eyes? and not use some other method