Originally Posted by
BobbyG
Even clip-on sunglasses, or flip-up clip-on glasses would provide some protection for your lenses.
This is a good point.
Small road stones that kick off a car tire could scratch glasses. But not if there is even a thin plastic protection layer like cheap sunglass overlays.
Any road stone that has the power to scratch the glass through the plastic layer probably has the power to knock you off the bike so you'd have bigger problems anyway.