Imagine being in a room that is completely dark. You can't even see your hand in front of your face. You stumble around the room, banging into walls and tripping over furniture. You have no idea where the light switch is or if there is even one in the room at all. You're trapped in total darkness.
Suddenly...*CLICK*...someone flips on the light switch and you can see.
Now, it's true that you were able to see immediately when the lights came on. But which came first, your ability to see or the flipping of the light switch?