PDF and adjust font sizes... Those two don't fit together very well...
Bad eye sight and PDF => you'll need a larger tablet, I wouldn't go below 10".
Buying books anywhere and reading them on your reader means a tablet, unless you don't mind stripping DRM and converting formats. Otherwise, you won't be able to buy from either Amazon (kindle format) or the rest of the world (epub format) (only two factions here!)
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