Think about a pair of transition wrap around glasses .
My Transition lenses don't turn dark when I wear my helmet. Perhaps the visor is opaque to that part of the light spectrum that makes them change?
Transition glasses don't turn dark with the visor down just like they don't turn very dark while driving you car ...i think there has to be direct contact with UV rays for them to activate .
That said some of the Bell Helmets have an optional transition shield which would be the ultimate shield to have but at the same time it won't solve the bug in your eyes problem when you flip up the shield while riding .
No matter though , i still recomend Glasses.
