Hello Gene! Still have the one piece Pronghorn I purchased from you last year! Just shot it today.
I wear progressive bifocals and found they are of limited use for peripheral vision. I must be looking straight ahead to see clearly. This is unaceptable for wing shooting or even trying to look to the side without turning your head too much.
I ended up purchasing a pair of single vision polarized sunglasses to wear for distance. I still carry my regular eye glasses for very low light.
I have purchased at least 5 different pair of prescrption polarized sunglasses over the years. By far, the best pair was my last (and current)from a store in your neck of the woods. Bend Sports Vision is a prescription sunglass provide for Smith Action Optics (
http://www.sportsvisionbend.com/)
This is by far the best pair of prescription glasses I have ever owned. The lack of distortion with peripheral vision is incredible! Plus with no prescription plan, I paid $285. I paid much more for glasses of lower quality. They have a lot of styles to choose from, and I believe they make regular presciption eye wear as well.
Unfortunately, I will likely need cataract surgery this year and will need all new glasses. Docator may not be able to entirely correct for astigmatism.
Good luck!