You can get problems if you stare at a sight picture for more 10-20 seconds as your eyes lose circulation and oxygen, specially if your neck and head arent upright. Be aware of good head positioning and breathing and shoot within 10 sec.
Also if you haven't got a cheek rest thats just the right height that will make it harder.
Check youve got the reticle focussed prfectly. Use the ocular adjustment firstcwith side focus set to infinity and loking at infinity ie a scene > 500m away or the sky. Look at the sky and think “thousand yard stare” then quickly glance through the scope for less than 5 seconds and thats where you want it hard and sharp in the fine wires. Once thats right, dial the side focus knob (parallax) to the range the target is at. The reticle should still be sharp but the targt should be sharp too. If you are very short or ling sighted that will affect the adjustment ypu needed on the ocular to get the reticle focussed. In that case, zero parallax wont coincide perfectly with a sharp focussed target. For group shooting on paper its more important to have the patallax zeroed but for hunting its better to have the target sharp for identification and shot placement. Small parallax errors wont lose you animals and you need to work on getting a clean sight picture and central view anyway which minimises parallax errors.
At 18x and 44mm its not a very forgiving scope.
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