Boresighting a reflex optic on AR

[Frog48]

I have a Bushnell Trophy MP on my Bushmaster, and I'm boresighting it with a laser boresighter.

When I close my left eye (like when looking through a magnified scope), the illuminated reticle and laser dot/point of impact are perfectly in sync. However, when I have both eyes open, the laser dot shifts to the left of the reticle... I was under the impression that since its a non-magnified optic, that point of impact should be the same if one or both eyes are open when shooting.

So... Should I line up the laser dot with the reticle with one eye open, or both eyes open?

 

[George Hill]

Boresight it with only one eye. You are getting a distortion because one eye is further away and your brain is combining the image... that's what it is supposed to do. As for the dot, it doesn't actually move.

 

[Frog48]

I figured the shift was a eye/brain perception thing. Thanks!