Why is riding a motorcycle with an open-face helmet without eye protection (such as a visor or certified riding goggles) dangerous?

1. Airborne debris, flying insects, and dust particles at speed can cause corneal lacerations, involuntary eye closure, and instant loss of vehicle control
2. It causes the motorcycle engine to overheat due to altered aerodynamic drag
3. It prevents the motorcycle turn signals from being seen by oncoming vehicles
4. It increases tire tread wear on the front wheel