Fought this problem for a while - have worn glasses since about age 5 or 6 (bad astigmatism / short sighted). never knew otherwise. Went to progressive glasses around age 40 as vision deteriorated both near and far, which made things more complicated.
parallax is a real thing, depending on how you shoulder the rifle, and be aware it can possibly can also cause a shift in POI between standing / prone too as the portion of the lens you look through changes. Ive found i often get a different POI to other people using the same gun. Depends on why you need the glasses in the first place, but if youre going to shoot with them it would worth checking if it has an effect, from different positions.
FYI - progressives are impossible for irons. I eventually had a pair of glasses made especially for shooting after struggling for a long time, and what a f*&%ing revelation! Prescription intended for computer use to give only short range vision, basically arms length + a smidge, and suddenly the front sight is crisper than ive ever thought possible. targets a blur but that doesnt matter. Pistols / rifles, shooting suddenly became a whole lot more fun.
You lucky buggers with good eyes - look after them. you dont know what you got.
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