Tim,
You can "train" your brain to use the eye you want. If you are right handed and use rifles and shotguns from your right side then train your brain to utilize your right eye.
This is not hard for most people (YMMV). Place a piece of tape (scotch tape) over the left lens of your glasses that you use to shoot with covering the area your left eye looks through. Because it is slightly frosted the brain will revert to using the right eye that has a clear (or clearer) view.
After several months your brain will be trained and you can dispense with the tape.
