I will throw my 2 cents in here. I am a retired optometrist and I’ve been riding reclined bents for 15 years. There are a few options, some cheap, others, not so much.
First, understand the concept of the progressive lens: distance on top, near on the bottom, they change progressively. Unless the segments are set really low, you’re looking through the intermediate part of the lens. So…
—if you want to stay with the progressive, when you go to get measured, take your bike in, lean back, and have the optician measure where you look through the lens. You probably won’t get much near, though, you’ll run out of real estate on the bottom.
—do the same thing, but consider the lowly lined bifocal. The line will be low and the segment small, but you’ll have enough to read a map or menu, not necessarily in that order.
—cheap option: take your favorite single vision glasses and get some stick on bifocal lenses from Walgreens or CVS. Stick them on low below your line of sight when reclined. If you go this route, a lower power will focus further away (think computer on handlebar).
Write back with questions.
Peace, Dennis