I routinely shoot a magazine or two weak-hand only (unsupported) during a session, and I change magazines using only my weak hand.
I will also shoot a magazine with my glasses off (using only clear safety glasses), just to remind myself what it will be like when there's time to grab a weapon or my glasses, but not both.
me too out to 7m and my eyesight is 400+ bad. does 2 things. i gain confidence and really focus on front sight. as i tell my friends, i can hit a threat at 7m without my glasses. i just cannot identidfy if it is a threat or not without my glasses.t