A diopter adjustment range of -5 to +5 on a night vision rifle scope refers to the ability to fine-tune the focus of the reticle for the individual user's eyesight. The range of -5 to +5 means that the user can adjust the focus from slightly more blurry to slightly sharper, over a range of 10 levels of adjustment. The diopter adjustment is typically located near the eyepiece of the scope and can be adjusted by turning a small knob or ring. It's important to note that this adjustment only affects the focus of the reticle and not the image quality of the scope.
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