I do have 20/20, thankfully. I think the tape idea will be very easy and an extremely cheap experiment.
If your eyes are fighting each other...
right handed..right dominant eye
Go to a store and buy a roll of the frosted scotch tape and put it over the non dominant left eye lens.
Are you saying to put the tape completely over the left lens or make a peephole out of the tape?
Actually, I'm ambidextrous. However, if it means anything, I normally write and wrench with my left. Normally use right on sports activities. I can use either, but out of habit this is my routine. Shooting is right handed primarily. Is this what you were referring to?
All the tests refer to me being left eye dominant, but not a very strong dominance.