I have no idea how people can shoot an ironed sighted pistol, with both eyes open. I am right handed and right eye dominant, but I still have to close down my left eye partially. If I don't do this, I see two sets of sights.
then you aren't focusing on the FS, or you'd see two sets of targets and only one set of sights
Seriously, that's the delimiter for me....
a good index lets me not even think about which image of sights to use with a target focus. Over the years I've been able to push that target focus out farther and farther. (occasionally when I'm really dialed in I'll notice my parallax set on the target with visual focus on the FS.). When targets get far or tight and I really start to focus down on the FS, I tend to squint or even close the weak eye, because the two target images gets confusing at speed.
I can't begin to shoot to my best up close with an eye closed. Has nothing to do with periferal vision or anything like that... It's a mental thing... It creates tension and tunnels me onto the FS and I start over aiming (including shifting my focus from target to FS) vs just letting it happen, if not resulting in outright trigger freeze...
But that's just my experience and doesn't mean it has to hold true for everyone
-rvb
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