Vision Changes with BG Fluctuations? Or High BGs?

A thought that occurred to me is that if she starts a game with a lower BG and is afraid of going too low, she could carry some glucose tablets in her pocket and just plan on eating a couple halfway through the game. It literally takes no time to do this, and won’t interrupt the game. I do this when I go folkdancing for 2 hours – no one even notices.