ORIGINAL: James B
I only have one eye so it was easy for me to figure out.

I had two eyes but lost my dominant eye in an accident. It was not easy learning to shoot left handed after 30 years of shooting righty.
I always had to close the left eye to shoot right handed, cause I'm right handed with left dominate eye, but in2000 I had the cataract removed from the right eyeand a lens implant. Ihaven't done the left eye yet, but the cataract in the left covers the pupil and makes me right dominate for now.