We should remember wile most people brain can superimpose 2 slightly different images given they have 2 eyes and do it ALL the time
, some people have different eye dominance so would not be able to process info from a RH sight without training unless they used the left eye instead for the sight (regardless of if they are left or right handed)
Likewise not everyone (fewer people) in all would be able to use a magnified image in one eye and normal focuses in the other eye, thats why fewer people have both eyes open with telescopic sights than with reflex sights.
Remember the brain is a powerful with respect to image processing, given that what out eye see’s and feeds to the brain is upside-down and the brain flips it the right way up and that the brain if we were to ware some special glasses that flipped the image upside-down after a few weeks to a couple of months the brain would flip the image so we would the correct way up agene as experiments have shown.