You can shrink or enlarge the type to fit as much or as little of it as you like on your screen. I could fit my entire one-page resume, which is largely written in an eight-point font, on the iPad's screen and still easily read it.
But the iPad Air's super-clear retina display probably helped. And it's worth mentioning that I don't wear glasses. People with impaired vision might have a tougher time. Either way, it's still a big upgrade from looking at the same document on an iPhone screen.