audio books digital

audio books digital
Is the Sony Reader good for those with poor eyesight?

I am legally blind, but I can still read large print. I already get braille, large print, and audio books from my state library for the blind, but some books I can only get through Bookshare (a service for the blind and learning disabled that produces books in .xml and .html formats from scanned books). I hate reading books from Gutenberg and Bookshare on my desktop, and my laptop doesn't have that great of a battery life, so I am wondering if the Sony Reader might be a good portable option for me. I can read print that is at least 14 point, but prefer 16 or 18 if possible. How large is the large font size? Are there any add-on programs or hacks that can increase the font size beyond what the machine ships with? Is the digital paper display comfortable to read for long periods?

I have a sony reader and not only is it comfortable but also its zoom function is able to make huge sized font (20 or more) if the book is from a pdf format but with the ones you have I am unsure.

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