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Other factors that might be important are the brand of the lens, or how it is fit in front of your eye.
There are many brands of progressive lenses, some much better (and of course more expensive) than others. Zeiss and Varilux Physio Enhanced, and Varilux Comfort being among the best. Then there are a whole bunch of knock off generics. Unfortunately, the profit margin is a lot higher with the knock off generics so that is what a lot of people get without ever knowing there is a difference.
In your prescription, if the optical center of the lens ("sweet spot") is off by even a millameter, in either or both eyes, it can cause problems. This is the biggest issue I see from places like C....o, or S...s. They get the Rx right, but it isn't fit properly.
Finally, no eye professional wants you to spend your hard earned money on glasses that don't work. Most will change the Rx and remake the glasses, even in a different style (standard bifocal), at no charge for up to a month if you can't get used to them. At least thats how it is here.
Hope that helps,
Charles
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