At the range I use an adjustable diopter attached to my shooting glasses. This increases the depth of focus to the point I can see the front sight and target.
My favorite sights for SD are the Von Stavenhagen dot - bar pattern Sig used to use. Even unaided by glasses I can get a sight picture with them. With the three dot pattern sights I struggle to identify the dot that is on the front sight since my vision produces two images of each dot.
"The world is too dangerous to live in-not because of the people who do evil, but because of the people who sit and let it happen." (Albert Einstein)