I got distracted between relays of a match and wound up using my regular progressive lense glasses to shoot my last relay, I usually shoot with a pair of Decot Hy-Wide glasses. The whole relay just felt wrong and my score suffered. Now I'm wondering if progressive lenses can cause some sort of parallax errors. Have any of you experienced this?
You provide very little information.
Is there any prescription in your Decot glasses? If so, what is the prescription?
For your progressives lens glasses, I suspect you have bifocals. What is the prescription for distance vision? What is the correction for close up.?
Are you using a riflescope? (you don't even mention what kind of competition you were engaged in.) If yes, do you have the diopter set for your Decot. or is it for something else?
Progressive prescription glasses usually have the bottom portion of the lens with the close up vision (what you would need to see the reticle properly) and the rest of the lens is for your long distance correction. I have progressives and I find it impossible to view the riflescope through the bottom of the glasses unless I'm lying on my back or cranking my head so far back I'm actually looking at the sky behind me. Perhaps you are a better contorsionist than I, but I suspect it might be the same for you.
Now, parallax is induced by the fact the image of the target is not focused on the same plane as the reticle. That occurs inside the quality riflescope. You should never have to adjust the diopter setting once it has been properly set, to get a clear picture of the focal plane witht he target and the reticle.
However, if you are messing around with prescription, non-prescription and so on, you are going to have issues seeing the reticle properly. Things get very dicey sometimes with vision and changes to setups with which we are very familiar and comfortable can be very disturbing and lead to error.
I would suggest that it was not parallax errors but rather that you brain was trying to adjust to a different setup. If you are older, this issue is more likely to occur so make sure you keep it as consisten as possible.
Consistency in shooting involves everything: ammo, hold, sight picture, vision, etc...