In a world where everyone can see, a blind person should have an easy time. Or so you would think. After all, if all those who have eyes look out for others, a blind person should be able to cross roads without any problem.
Try closing your eyes while crossing the road!
We have eyes but we always expect others to take action. Sometimes we take (evasive) action - and follow it up with a round of cursing, since someone else is to blame. As I said, the others need to take action, not us.