At one point several years ago I did take my International Air Gun to my optometrists, office (called to make sure it was permissible first), and he measured the distance to make the front sight very clear. That worked for a period of time. As my eyes changed I went to no line trifocals, and had a very bad time for awhile. The red dot sight saved me from quitting bullseye altogether. As you age your eyes lose a lot of their elasticity and therefore your focus changes. The red dot equalizes that. I have a shelf full of different red dots I've used, and currently it is the Burris FastFire 3.

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H Richard
SWCA1967 SWHF244