As I’m getting longer in the tooth I’ve needed glasses to read and due to West Nile my eyes no longer line up vertically. I need glasses.
I have one set of bi-focals. I have several pair of continuous change glasses. The bottom is good for reading and the glasses correct how my eyes line up.
With these continuous change glasses shooting is easy especially for iron sights.
Ditch the bifocals except for reading and other things. Get the continuous change glasses for shooting.