It's like using a single-ocluar microscope: you focus on the subject with one eye but keep both eyes open. Your brain does the rest. Have you ever done the dominant-eye check?
This trains the brain to process an image from the dominant eye, while preventing extraneous movement of muscles (by closing the non-dominant eye). It also helps, with practice, to expand the visual processing of the scene (the so-called tunnel vision)....movement in the periphery can be caught by the non-dominant eye, and helps to keep situational awareness. Tunnel vision is as natural as it is unavoidable.
I shoot pistols and scoped rifles with both eyes open, and iron-sighted rifles with non-dominant eye closed.
There is no black and white set in concrete declaration that it must be done this way. You work with whatever method works best for you!
Cheers!
This trains the brain to process an image from the dominant eye, while preventing extraneous movement of muscles (by closing the non-dominant eye). It also helps, with practice, to expand the visual processing of the scene (the so-called tunnel vision)....movement in the periphery can be caught by the non-dominant eye, and helps to keep situational awareness. Tunnel vision is as natural as it is unavoidable.
I shoot pistols and scoped rifles with both eyes open, and iron-sighted rifles with non-dominant eye closed.
There is no black and white set in concrete declaration that it must be done this way. You work with whatever method works best for you!
Cheers!