As my eyes get older the pins become more blurred. The target and pin don't line up as they once did. Focusing on the pin the target is clear.A small black dot stays one shape, but looking at the black dot makes the pin double vision. Have toyed with the idea of a clarifier. Don't need to yet.

It's not an uncommon way to shoot. Have read of others who do it as well. Actually they explained it to me.