I have a slide down "sunglasses" thing on my helmet but I still ride with regular sunglasses regardless if the visor is up or down. And yes it should be common sense to ride with some kind of eye protection. I'm sure we all have been smacked in the face/helmet a time or 2 by rocks or bugs. Even the smallest freaken bug can feel like a paintball being shot at you at point blank range. how about one of those to the eye? not fun I would imagine and hope to never find out.