Fred, I'm sorry to hear that and hope you're able to find ways to continue seeing well enough to do everything you enjoy.
I would assume you have discussed this with your doctor, but just in case you haven't, here it is. There is an eye injection that is used to slow AMD. The medication is called anti-VEGf. I have received several of these injections for my eye health problems, which is not AMD, but I know they use it for treating AMD and in some cases it can improve vision in AMD patients.
Anyway, I've really enjoyed reading everything you've shared here and love seeing your beautiful rifles.