As Tentman said, set the reticule focus with glasses on. I've shot for 45 years with glasses for shortsightedness, never had an issue except for fogging in our alpine country. Then I changed to progressive lenses a few years back, bottom of the lense for close up, to top of the lense for far away. Never had a problem, though I do find the progressives seem to be a bit more "accomodating" for want of a better word. On ducks I have no issues, but for clays I use to go back to single lenses until I learnt how to use the progressives. And lightweight, thin frames make a big difference too.
The secret is in focusing the reticule, not the target. The eyes will do the rest.
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