I disagree with your descriptions of both-eyes-open and the Bindon Aiming Concept as they apply to 1x and magnified optics.
Shooting with both eyes open as with an Aimpoint or EOtech is just that...shooting with both eyes open, with a focus on the target, rather than the optic or red dot, which allows a perception of the dot sort of "floating" on the target while the optic itself blurs. This allows better peripheral vision, depth perception, and target acquisition than closing one eye.
The BAC
is for use with ACOGs and other magnified optics with illuminated reticles. By keeping both eyes open during scanning and target acquisition, the dominant eye is looking through the magnified optic, and the non-dominant eye is seeing past the optic (no magnification). When you are scanning, or tracking a moving target, the view through the optic for the dominant eye tends to blur while the non-dom eye focuses on larger picture. But because of illuminated reticle, the dot (or triangle, chevron, etc.) gets superimposed on the picture. When the dot is over the target, it stops (assuming you're scanning for and acquiring a stationary target) and your dominant eye focuses through the optic, taking advantage of the magnification. If it's a moving target, either you can take the shot with both eyes open, using the combined images similar to an 1x red dot or occluded optic, or you can close the non-dom eye once the reticle is on target and let the dominant eye take over. Trijicon's website has a
good explanation and demo if you've got the ability to watch a short video.
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