Not sure I'm following your question, but here goes my best effort:
You do need to focus a riflescope, just not the same way you would focus binoculars or a camera. OK, to focus a riflescope you want to point the scope at the sky (away from the sun) and focus the reticle (crosshairs) for best sharpness. This will prevent your point of aim from shifting regardless of how near or far away you are aiming the scope at your target. If done correctly, you should not see a shift in the target image as you move your eye from side to side or up and down.
Hope I haven't lost you there.......
Jim