I wear prescription glasses, my son-in-law wears contact lenses with safety glasses when we shoot. When we both shoot the same scoped rifle, very consistently he will group about 2-3" at 2 o'clock from center of my group at 100 yards, or I will group about that distance at 8 o'clock from his. This has been very consistent with several rifles. Of course each of our own rifles is zeroed to our own centers, but it tells me that either there us some visual distortion due to corrective lenses, and/or some issues with the differences in eye relief, and perhaps other physical factors between the two of us. Before experiencing this, I never gave it much thought and assumed that shot placement would be (visually) pretty much consistent with the same rifle, no matter who shot it. Seeing this consistently happen with with my son-in-law indicates to me that this is not always the case. Perhaps our differences are unusual - I haven't tried this with other people, so I don't know how exceptional this 2-3" difference is. I think everyone shoots everything just a little different than the next guy, but probably not as much of a difference as my son-in-law and I. I bet a couple shots would confirm that for you. Good shootin'.