After two cataract surgeries, with sight improved, I still found only one way to increase sight visibility.
I took a 45LC cartridge and torched it, dunking it in water to anneal it. Then I used a heavy gauge scissor and cut a strip off of it, about half an inch long and a quarter wide. Then I wrapped it around my thick front sight from back to front, tapping it for a close fit. A little crazy glue and some file work keeps it low profile enough that you gotta look for it.
Then I went to my rear sight, and with a half round hollowed out the middle of the sight. Hack sawed a notch at the bottom of it and went back to the range. When I benched the gun, I gradually brought the front sight down until the top of it lined up with the top of the sight while centered on the groove. The sight picture looks somewhat like an M-1 Carbine where you are looking through the ring and entering the front.
Now I am punching out orange dholes on my shoot n c targets. I make sure to avoid filing the rear sight to pretty it up, keeping it rough cast and dull grey.
This works well enough that the only things I have to worry about on trail walks is my follow through and my old man aching back.
Anybody know of a vendor selling new backs and legs?
Don't shoot yore eye out, kid
The Capgun Kid