Here is something to try to get use to both eyes open. In competition, I blacked out the left lens of my shooting glasses. You keep both eyes open, but you will have no problem with target alignment and shooting. Once you are use to having both eyes open, try shooting with the cover removed.
US Naval Aviation AMSC 20 years ( retired) ASW/Aircrew Wings, P2V plane capt.
US Naval Academy (DI) Shooting Instructor (Annapolis) NDW shooting team member and a lot more stuff!
Alway keep your six covered