We had a good discussion of this topic recently in a thread labeled "Need magnification suggestions." I've moved it to the head of the line; it should appear just below this one.
The solution to the problem varies with the individual. My left and right eyes are 55 years old, and they've aged differently; without my glasses I have trouble getting both to focus simultaneously on anything within about two feet. "Optivisor"-type magnifiers don't work well for me. The best solution for me is a pair of flip-down magnifying lenses, which I can fasten to my regular glasses. But people with different kinds of vision problems need different solutions.
There are plenty of options out there. It's worth taking a look at several. Good luck.
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