Interesting…
Haven’t done the dominant eye test yet, the only real object the required distance away would be my neighbour across the street and i’m sure she wouldn’t appreciate the pointing…
I did notice that my focus kind of flickered a bit before the effect worked so that would be my brain being fooled 
Which one’s the test where: you hold both hands straight out so your hands form a tiny triangle hole between the two thumbs and the sides of your index fingers, look through the hole with both eyes open, slowly draw your hands back to your face while still looking through the hole, and whichever eye the hole lines up with is your dominant eye.?
I did this at a rifle range to find out which eye I should aim with. From this discussion, it sounds like some people don’t have dominant eyes. I thought that everyone had one because I never knew of anyone who this didn’t work for.