I know this means i need to get my eyes tested but I was at the range yesterday zeroing my new scope. Once the rifle had been zeroed we checked zero at different mags etc. Once I was happy with that the turrets were set and a final check, this is where my eye looking through the scope started to loose focus, I had to adjust the scope to get focus back and it was constantly going in and out of focus... my group started to horizontal string.... I have had this focussing issue on the range last year on a different scope. My eye yesterday evening was aching and is still aching this morning...
Basically are my eyes going or is there something about the scope set up that is causing this?