I don't use any of those, my main screen is 1280x800, my secondary is either 1280x768 or 1200x1200 (or somewhere in there) depending on what kind of mood vista is in when I plug it in and where the moon is in the sky and whether or not it's Tuesday on Romulus
I was having trouble with blurring and thought it was my eye's. When I plugged in a Wacom tablet I noticed that I still had the VGA connected and switched to DVI.
I have one good up close "my original lens" and one good far away "my implant"
By the time I had my second eye done, with my EXTREMELY strong glasses on (just the lens were £350 - and one had to be thrown away!), I could only read about 2 inches away from my left eye.
Without the glasses (or 'glass' as they had only one lens ), I couldn't get close enough to read at all.