I am right handed/left eye dominant.
I wear glasses.
I recently took a skeet/trap lesson from a local elderly gentleman who has taught for years, and used to be a trick shooter, back in the day. He tested me for eye dominance. Without saying a word, he reached into his pocket, pretended to fumble around and then suddenly put a small sticky piece of textured flexible plastic in the center of my left eye glass. It blurred my left eye vision and forced me to use my right eye for sighting. What is great about this is that I don't close my left eye, and keep the field of view with both eyes open. It does blur my left eye, but I can see clearly because the right eye takes over.
I saved that small piece of plastic, as it can be reused. The problem is that I've been trying to identify what material it is made of, but have had no luck. It is sticky, but sticky without any glue. (I'll have to call the gentleman and find out what he uses). Whatever it is, he cut it out by hand. It's about the size of a finger nail, so it doesn't cover the entire lens. I talked with someone recently who had heard of this technique - but this other technique uses a fogged piece of plastic tape.
Since using this trick, I find that I now acquire my sight picture much faster and I believe my shooting is more accurate. It's much more comfortable than tilting your head over to use your left eye.
Hope this info is helpful.