I use two workarounds, both just ok. And one expensive personal fix.
When I am viewing email in my Inbox, for example, I can use the keyboard shortcut Cmd+ (Command, Shift Plus Sign). That enlarges what I am reading. When I reply, the text I type cannot be enlarged this way. I have not found a way to do that.
When I really want to see the detail I use Zoom It (ver 1.1) from Appatit. I don't know much about them, but the magnifier is excellent.
Expensive personal fix: I went to my optician, showed her the problem and she had glasses made that enlarge an extra bit at the very bottom.
There are a few human factors issues that Apple is not addressing. I am wondering if it is still a high priority at Apple after Steve Jobs is no longer there to rage for the best possible. He was difficult, but this is a highly creative and competitive arena. I want the best for Apple, but ultimately, for me.