I’ve had very good luck buying bifocals online, so here’s a try at
answering some of your questions. (I tried progressives once and
didn’t really try hard to get used to them. I think the whole idea
behind them is wrong for me, but some people love them - maybe one of
them will respond here.)
Zenni Optical has great prices, and I love the bifocals I’ve gotten
from them. They only charge $17 extra for bifocal lenses, and even
their under-$10 frames are very good. With prices so low, maybe you
could afford two pair with different ADD strengths or one pair of
bifocals and a pair of reading glasses just to get a feel for what
works. Even if you only "need" an ADD of +1, it could be that +1.50 or
even +2.00 suits you given where you like to hold a book, whether you
sometimes read in not-so-well-lit places, or whether you sometimes
need to do close work like threading needles.
What works and whether bifocals are worth it at all depends on many
things - is it simple to keep reading glasses or a magnifying glass
handy instead? On the road, or if you go back and forth between close
and far frequently, bifocals are great, though. And at Zenni prices,
why not find out. (Bifocals aren’t very helpful for close work in the
up direction, of course.)
As far as adapting goes: For me, it was easy. Frames with an
adjustable nose piece are a good idea, so you can get the line to be
in exactly the right place. (At the bottom of the windshield for
driving, maybe a bit lower for a balcony seat in the theatre.) It’s
possible bifocals were easy for me because I used to read without
glasses or by looking underneath my lenses. My sense is that few
people have much trouble adapting.
As for the small reading area, my frames have lens heights of 33-35mm,
and the stronger D-shaped part is big enough. I wouldn't go with
anything below 30mm high, even if the retailer will let you. At least
one online retailer (I forget which) lets you choose between two
different D-section sizes, and another (or that same one) provides a
couple of options about where the line goes. Since Zenni bifocals work
for me, I haven't looked into those options again. Once I saw Ben
Franklin type half/half bifocals somewhere and was tempted, then lost
the bookmark.
For the record, my prescription is a bit weaker than yours: -.75 sp, -.
75 cyl in one eye and only astigmatism (-1.75 cyl) in the other eye.
At age 54, my ADD is about +2.25 (unfortunately, things progress like
clockwork). I’m basically down to zero accommodation now, and I can’t
use my bifocals for middle distances. So it gets complicated, or fun,
depending on how you see it. For computer work or helping students
over-the-shoulder, I wear special-purpose glasses. I have computer
glasses that are +1.25 on top of my full prescription, and if what I'm
doing is all at one distance, I like having the entire field of view
in focus. For teaching, I have glasses with different prescriptions in
each eye. I even have some super-reading glasses that are +3.50 beyond
my full prescription to use for things like changing a watch battery
or sewing a button! At under $10/pair, why not...)
I don't wear contact lenses, but as your ability to focus close
diminishes, you will have at least two choices: change one of the lens
prescriptions to work for reading (mono-vision) so you can read with
your contacts, or use readers (buy those online, too - better quality
and frame choices at a much lower price than the drugstore).
Personally, I don't like having my eyes differently-focused unless I
have to, but some people don't mind.
So there's my all-over-the-place answer.
Steve