The vision part is why most medieval helmets have a hinged visor which can even be taken off on bassinet models of this time period. The common foot soldier usually didn’t even bother with visors and such.
I doubt this would work very well considering most folks who could afford armor also had at least one riding horse. It might work in mountainous terrain like in Wales but you can simply remedy this by not going after the archers and instead burning down their village down below at the bottom of the valley.