Reading ebooks - do you print or squint?

I've been reading this forum for a while now and it's great! Thanks for the excellent info. I'd like to ask members a couple of questions:

1 : Do you read ebooks on the computer screen or do you print out a hard copy?

2 : If you're a squinter, what do you think ebook authors could do to make on-screen reading easier?

I confess I'm a squinter myself - I just can't wait to get the good oil!

James