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My eyes are 100% co-dominant. I tried the close one eye and stare at your thumb and a reference point and there is the same amount of shift no matter which eye. I'm serious about seeing two different barrels when I look down my shotgun. They spread out in a narrow "V" shape so I just keep my left eye closed.
Maticuno:
Here's another test -
Hold both arms out (fully) and make a 'triangle' by your thumbs touching, and your index fingers touching, directly in front of your face.
With BOTH eyes open, look at an object, such as a door handle, centered in the 'triangle' you made with your fingers/hands.
Without moving your hands/arms, first close your right eye. Now open your right eye.
Now, close your left eye. Now open your left eye.
IF the object (in this instance the door handle) moved when the right eye is closed, you are right eye dominant.
IF the object (the door handle) moved when the left eye is closed, you are left eye dominant.
I've never heard of 'BOTH' eyes dominant. How's your depth perception???
I have done a fair amount of trap shooting, and I have noticed several people with a cardboard patch over one side of their shooting glasses.(Non-dominant eye). Go to the library and check out a book on trapshooting. It will cover everything you want to know, and then some. I use both eyes, but with a scope I close one. Last yr I broke a 99. Not bad for a once a yr trapshooter, with a full choke.
With my Glock, I use both eyes. Rifle with a scope, I use my left eye with the right closed. I once tried using just my left eye when shooting my Glock, but always ended up a bit off to one side. With the rifle & scope combo, dead on every time.
Being right handed, but left eye dominate, I had to learn early to shoot off my left shoulder. I found this out while trap shooting with a very light 12 ga. Stevens single shot. I just had no idea why people enjoyed shooting when it hurt soooo much! I was actually leaving tooth marks in the top of the stock because I was leaning over the top to sight with my left eye! When I tested for the dominate eye and then learned to shoot off my left, I found I did like the sport.
By learning to shoot from both shoulders, it really helped me in the field too. Depending which way the birds or rabbits flushed, I could swing easily to either side. Of course, I had to learn to shut my left eye if I shouldered the gun on the right.
My problem now is shooting a handgun, right hand hold with left eye sighting. I have to hold the gun slightly offset to use both eyes, and it can be difficult. I have tried to hold in my left hand, but just not comfortable at all, even after several thousand rounds practice. It is also very difficult for me to have the holster on my left hip and draw being right handed.
I can switch back and forth between shooting fight eye open, left closed to left open, right closed. For some reason I can do evetrything ambidextrous from writing to shooting.
I'm one of those lucky people that's Right Handed and Left Eye dominant. But I've always shot right handed. When it comes to shooting Trap, I usually close my left eye and I do pretty good.
Here is what I can do with a 10/22: