The sight radium is a help for old eyes. Sights are poor but they stand out better.
I found a device called an Eyepal. Its a peep sight circle (3/4 inch across?) that is static cling to glasses with a small peep type hole in it. Basically its a peep sight on your glasses (static cling fades so I put it on an old pair of glasses and leave it there, in a case that stays in my range gun box).
There are two of them, one for rifles with a smaller hole. One key to it working is a clean cut edge. You can make your own but hard to get that clean an edge on anything.
It helps a lot. Something about peep sights worked better anyway and don't ask me to explain it. I shot a lot of 1917 Eddystone 3006 and they have a great peep sight setup.
One downside is if you are shooting into the sun it washes out. Our pistol range has sun right at it latter in the day, so I shoot the BP and other unemtni8onsals in the morning and move over to the rifle range (or go home) in the afternoon.
Its what has allowed me to shoot pistols again decently. I built up an odd assortment over the years and now the 4 BP pistols. The ROA is better than the 47 Walker as it has vastly better sights though not as long a sight radius.
I opened up the rear notch on the 47 Walker and that with the Eyepal gives me a decent sight picture.