It was a nightmare trying to get big enough lenses for varifocals when the fashion was for very shallow glasses (possibly the fault of some female newsreader whose name I can't remember).
I like my glasses to stay in one place on my face, so I insist the dispenser bends the arms into an old-fashioned hockey stick shape before they mark up the lenses.
Expecting fun and games when I get a new prescription in a few weeks - after two cataract operations.
I now realise that it is not in the optician's interest to refer customers in good time for cataract surgery, after which they might not need such a complicated (expensive) prescription. It's more profitable to keep saying you just need a new prescription.