I was reading a competitive hand gun training book last night and ran across a small section where the distinguished author stated that both eyes need to be kept open while shooting bullseye (conventional) pistol. Does this technique also carry over to other handgun disciplines, ie. IDPA and USPSA???? I have been shooting handguns for the last 10 years while keeping my weak eye shut. What/how should I train? 
P.S. This isn't the first time I've found out that I have been doing something the wrong way LOL!

P.S. This isn't the first time I've found out that I have been doing something the wrong way LOL!