LOL, Surapon! This post once again justifies Rusty's signature line' "Yes, but what would Surapon say?"
It is a funny post which nevertheless accurately describes the science behind it. You are a genius, sir!
I am also right eye dominant. However, I use my right eye in the VF because (1) it keeps my nose away from the LCD screen but more importantly (2) it allows me to keep my left eye open and help compose. I was trained to use both eyes in a scope from using old-style microscopes in medical school. Also, as Surapon said your vision is affected if you keep an eye closed, which is why during eye testing at the optometrists the non-tested eye is kept open but shielded.
The test is not quite what you did. You need to keep looking at the pencil- it helps if the background is close enough so it is reasonably well in focus. For example, line up a point on your computer screen with the pencil, and look at the pencil with both eyes open. Make sure the pencil isn't too close to the screen or else the effect will be too negligible to notice. Let's say pencil at 25 cms, and the screen at 3 feet. For right eye dominant people, the point on the background and the pencil are still lined up when you close your left eye, but when you close your right eye the background seems to shift to the left. It is still possible you are in the minority without a preference for either eye.
I am right eye dominant and right handed.That sounds pretty weird compared to the rest of us
So I'm weird too? I'm also right handed and my right eye is the dominant one. Therefore I use my right eye to look through the viewfinder.
Another reason is that I like to close the eye which I'm not using which I only can in this combination (right eye open, left eye closed). Maybe if this also worked the other way round I could try to use my left eye more often
I believe right eye dominance is much more common that left eye dominance. This trait is completely independent of right or left handedness (and here too, right handedness is much more common). Therefore, as a combination of independently sorted traits, right eye-right hand dominance is more common, although in lesser frequency.