Massachusetts it is required during lerners permit and a windshield meets the requirement.
I find it odd that eye protection is not mandatory for bikers. There must be a lot of good reasons for it to be a requirement by law. One reason that i have is a pedestrian is at risk from an approaching biker recieving a sudden eye injury. And a small stone kicked up on a highway, like the one that puts a divit in your car's windshield, could create multi-vehicle chaos should it nail a biker in the eye.
Come to think of it Wart, this country does not have mandatory eye protection, not in this state anyway. Helmets are mandatory but not goggles.