With a check of 0, you notice stuff that's totally obvious, like the fact that there are spiders crawling all over the walls of the room (so many you can clearly see them at any distance). You notice that there is a man standing out in the open (I've always ruled that Spot checks to notice someone not attempting to hide are at DC -10, so you can see someone quite a ways away with the -1 check penalty per 10 feet rule).
However, with a check of 0, you will not see:
A rogue with a Hide of +0 or greater, even if they roll a natural 1.
A rogue 10 feet away with a Hide of -1 or greater, even if they roll a natural 1.
A rogue 20 feet away with a Hide of -2 or greater, even if they roll a natural 1.
And so on.
Instead of saying your character became temporarily blind, perhaps he/she was just horribly distracted by something?