In addition to just wearing my regular glasses, I use a rear view mirror that attaches to the stem of my glasses when I'm on roads and not bike trails. That way I can see what's behind me without turning at all. I have a pretty strong prescription, but I have never noticed the peripheral vision problem mentioned. I can certainly see how that could be a problem on a mtn. bike. Maybe I'm too new at this to be sophisticated enough to know that I have a problem!!