Even if you have perfect vision, indulge me here for a second. You know when you go in for an eye exam and you're asked to look at a combination of letters and numbers on a chart against a far wall? You read the first few lines, then realize you actually can't go any further. Then you get prescribed glasses (or contacts) and you can all of a sudden read every letter and number. And even the ones you could read before are now so much clearer.
That's what it's like looking at the new iPad versus the older iPads.