I'm right handed left eye. My right eye cannot be corrected to a point where I can see a front site clearly. I stopped shooting with a Weaver stance and changed to more of an even relaxed facing the target stance and I can just move my gun to the left a little and it is lined up with my left eye. Support hand is doing most of the work anyway and it lines up with the left eye.
If you use a Weaver stance and you don't have glasses to correct vision then just turn your head and your correct eye will be moved to the be in line with the sites.
I'm learning to shoot rifle left handed.