Got my Cosina +2 Diopter Eye Ring
I took my XP1 to my eye doctor after discovering that I had to hold my camera at the very bottom of my progressive glasses to see that data in the viewfinder. This caused me to have to hold my head at a very uncomfortable angle (metal cage over 6 of the bones in my neck). I ordered from a company in NY and they had it to me in 2 days for $19.00. What a difference it has made. Clear sharp data in the finder in the center of my glasses!
see about me in my profile for more info