Re: Ipad2 or new iPad 3rd gen screen
Hello frazer. You're best bet is to go to a phone or Apple store and get a demo iPad in your hands. How you perceive screen content is a very individual thing. With one switched on, you should be able to access the brightness control in Settings and hopefully you'll be in a shop with daylight streaming through a window.
You can also pinch and zoom the screen to make content bigger to aid reading.
The latest iPad has phenomenal resolution which should also help text to be more legible and less fatiguing to read.