Hi @PeterE1959. I am identical to you. I have 20-400 in my right eye and have had my PPL, 3rd Class Medical since 2004. The key is to obtain a SODA - Statement of Demonstrated Ability. This is a mini-check ride of sorts where an FAA check pilot will fly with you and write you off as competent to fly - At least that’s how it was when I received mine. The SODA sticks with you for life so each time you go for your medical, you show the SODA and it enables you to “pass” the vision section.
I struggled through so many medicals until one AME suggested this and it was a game changer for me.