Another way to think of it is this, I look at something I see it (and everything else twice) but when I close my right eye, the image which appears to "disappear" is the one on the left. It happens least when I am wearing no focusing correction (lenses of some sort) - but you know, focusing is important for airsoft and other activities.
When wearing no lenses, it only happens when I'm tired or not concentrating, but I am very short sighted (for reading) - I need lenses to function.
Samurai, imagine how this makes websites like the daily mail almost impossible for me to read. As - while the object of my focus from the right eye is projected to the left of my good (left) eye's identical focus - anything to the right hand side of the object of my focus is dragged over the top and simultaneous underneath the image of primary focus for the left eye.
Just drag any image on windows so you get a ghost and that's what I experience except neither image has behind/infront priority.
It also means at the cinema I must sit as far to the left as possible so that the angle at which fire exit signs on the right side of the theatre is small - if I sit on the right the sign can migrate up to 10 metres on a big screen vs less than 2 if I am sat to the left side. Signs on the left side have no effect on me.
It's a really sh*tty problem and I haven't even told you guys about the really obvious bigger problem since what I have elucidated here is about 'perception' never mind dominance (I can consciously reverse it so that instead of everything being from the perspective of the left eye it switched so it's all reversed - when I lose control of this.... I have no choice but to close my right eye).
I'm soapboxing a bit here, sorry, it's not as bad as it sounds because its a perception malfunction not a so much one of vision - that is the issue is neurological/muscular, however since my vision is so much better in one eye than the other its difficult to explain the whole situation other than to say:
In airsoft it is impossible for me to ADS with both eyes open if the cheekweld is from/for the right eye - but my learned left eye dominance means that I have no issue with the reverse.
Here's the crux (edited in):
The reason for this is that I have instinctively learned to live from the feed at the left eye, so if I ADS with a right side cheekweld, I will be attempting to shoot things which are around 5-10 degrees to the left of the barrel because while my right eye is correctly looking at the red dot there will be a second red dot in my vision which is over to the left a bit, but it will be superimposed over where my left eye is looking an the left eye is dominant.
So while general advice is "learn to use the other eye, or other hand, I am simply not capable of using the other eye without closing the stronger one.
When I was aged 4-6 I used to wear an eyepatch over the dominant eye.
I just experimented with my AEG, and you can experience what I see. Get a gun with just iron sights, focus on the front sight (ignore the back), now alternate closing each eye and you can see that there are two different images, from slightly different angles which merge when both eyes are open:
When I have corrective lenses I don't experience that merging, I just see the feed from both eyes separately, and it just happens that because my right eye is lazy (to the right) my brain pulls the image across further than necessary so not only do I see two images but they overlap.
If you with the gun staring at the sight quickly alternate winking you will experience what I experience to a lesser extent.
I'm sorry I lack the vocabulary to better explain this, my opticians always tell me its quite unusually for persons with this problem to have the level of conscious control I possess. H onestly the best example is taking an image in windows from a browser and dragging it for the c&p ghost.
But here's a real spanner for you if you've read this far - the image which moves from the right eye across my left also moves vertically... (about 3 degrees up)