I might add a thought to consider it's not likely only a simply of text size.. The eink devices are not backlit and you likely need a high contrast screen. Since you won't have a light to help bring out the text, you might not have sufficient contrast on any current e-ink display.
My mom is legally blind due diabetic retinopathy and she cannot make out wording very well on the Sony 505. It uses the same display as the Kindle.
But the good news is if you do get a Kindle and can't read on it, it would likely sell on eBay for much more than you paid...or at least very very close by the time you get yours.
I would suggest if you have a Border's bookstore or some other retail outlet that carries the Sony devices call and see of they have a demo 505. If you can read that then you can read the Kindle. Or I should say if the contrast ratio is high enough for you.
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