Every state in the union REQUIRES cover for the eyes for any cycle.
Be they glasses or face shield. (Bicycles ARE considered as vehicles
in all states.)
This law is mostly enforced for MOTORcyclist but with the number of
folk's now riding human powered cycles the law could be applied also
to them.
While I don't know British vehicle law I'm sure that the Brits are smart
enough to require some eye cover also.