Some people, like myself, have a stereoscopic vision problem (essentially left/right eye synchronization). It doesn't usually bother me at all in daily life, but I, for example, can't do some things like see 3-d effects or shoot with both eyes open. I have to close my other eye to be able to adequately concentrate on the sights, if not my eyes "fight" for control depending on what I am trying to focus on. You might be able to actually train yourself by doing things like the suggestions above, but I just close my non-shooting eye. Works well enough for me anyway. Just a thought.
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