Originally Posted by
caloso
There are plenty of sweat bands designed to go under helmets. An old roadie hack is to cut the top off a cycling cap and wear it backwards. The brim draws the sweat to the back and down the neck rather than into the eyes. Not the best picture, but see here.
The Republic of Offthebackistan
For most of Europe, helmet is not required by law, and not needed for safety (with any amount of caution and common sense), so one problem less - just the cap.
As for glasses - debris is less of a problem here as well, it's the sun and the insects.