Here is a reference to a test that makes more sense.
Try these easy tests to find your dominant eye.
www.allaboutvision.com
It uses a triangle of the fingers to center an object with both eyes open.
Then you can see where the shift is when each eye closes.
In my case they shift in opposite directions at about the same amount of shift.
So; basically no dominant eye Or the prisms in my glasses are working top notch.
The thumb test below the triangle test works better-perhaps-as it is difficult however once my thumb is over the background object(I can both see the thumb and the object superimposed)then when I do the test I find my right eye is dominant.
The index finger would also work; however only if you are using it to cover a far object just as In the thumb test.
However it is interesting that the triangle test yields different results.
This most likely has something to do with the difference between focusing on an object in the center of the triangle as opposed to focusing on the thumb that covers that object; and how each method is processed by the brain.
Further testing, when using an object a arms length in the thumb test it is much easier to conclude that there is no dominance; however I suspect that it is part of the aspect of angle and distance and that the small difference is difficult to detect at such a short distance.
To be fair: I did this test both with and without my glasses and the result is the same.