Any tips on stopping tunnel vision? Or constant peripheral vision during team fights?

I was just wondering if people had tips on tunnel vision? Normally in big team fights my eyes pretty much automatically just focus on health bars and occasionally skill shots and i kinda just switch to mainly my peripheral vison to catch all the action or mainly health bars especially as a support main and often times find myself fixated on a certain health bar and set a goal to delete it or make sure it stays nice and green pretty much ignoring all others and miss allot of things... At times I can conclude weather its a lost cause or a good go but mostly not the right choice and normally they would have to be isolated and mostly take forever to decide lol. Any tips on preventing this or getting out of this nasty Habit or is this really just something that comes along with experience cause I play off and on but I can't seem to kick this habit :/