I just can't have a frame at the bottom of my vision area. I've missed cars due to the bottom of the lens frame when I looked back quickly. For me the glasses I got did two things I needed besides the obvious, they allow me to actually see when I look behind me and the wrap is tight enough that air doesn't get behind the lens and make my eyes tear. For some odd reason I must have sensitive eyes with regard to wind whipping past them at close proximity, or perhaps some glasses just accelerate it somehow.