by Mike Straw
Although we’re symmetrical bipeds, we’re asymmetrical in
that one side of the brain or the other is dominant, creating
a “dominant” side and comparatively “non-dominant” side.
people are left-brain dominant, meaning that left-handed
people are the only ones in their right minds.This follows
through with the eyes as well, but the eye on your dominant
side isn’t necessarily your dominant eye. Our ability to
aim is accomplished using the dominant eye, but which is
it? How can we find out? Bring your index fingers and thumbs
together at arm’s length making an “o,” focusing on an object
beyond that distance. Bring your hands, still in this position,
back to your face. The eye that looks through the “o” is
your dominant eye.
(This picture is
an example of "cross-dominance")
Aim is defined as the relationship of the dominant eye,
the front sight, the rear sight, and the target in relation
to each other. An important caveat: under stress, you’ll
lose up to sixty percent of your sight through tunnel vision:
you can only see and focus on a cone of about five degrees.
You simply don’t have sufficient peripheral vision using
only forty percent of your sight to detect tactically moving
or additional threats. Doctor Jean Williams of the University
of Arizona reports that we lose up to twenty percent of
our peripheral vision on each side simply from observing
someone do two things at once!
one eye while shooting. You’ll develop an unbreakable habit
that can get you killed. You’ll naturally concentrate on
the information provided by your dominant eye if you don’t
let yourself get distracted by information provided by the
non-dominant eye. Just cultivate the habit.
Why? What we
ask the body to do through training will be over-ridden
by instinct during stress. As stress increases, our body
automatically squares to the threat because our pupils dilate,
rendering front sight focus impossible; the lens flattens
and the eyes begin to move in a saccadic fashion: a rapid,
jerky, irregular scan. During saccadic motion, the brain
can’t process information, so we see only in glimpses. The
only possible way to focus is through summation of two optical
signals -both eyes must be open.
The front sight and rear sight should be placed at eye level
with the front sight blade placed in the center of the rear
sight notch. The top of the front sight and the top of the
rear sight should be the same height. The front sight should
be positioned so it appears to be in the center of the rear
sight notch with an equal amount of space on the left and
right side of the front sight blade in the rear sight notch
creating what is called a “sight picture.”
This front sight-rear sight “picture” should be placed in
the center of the target, exactly where you want the bullet
to go. Only the front sight should be in focus,
and the sights should be properly aligned over the threat.
This is the sight picture.