You sometimes rub your visor with your glove, or a paper towel, although this is absolutely not recommended. Just like tons of insects, rain, fog, a pebble or some sand. And that's just while riding to work every day.
Wear is inevitable and better your visor than your eyes, we think. But, anyone who has been on the road with a scratched visor in a rainstorm after dusk knows: there are suddenly too many lights. Quite life-threatening.
When riding a motorcycle, looking at things (the viewing technique, that the riding instructor always stressed) is essential and a perfect visor is necessary to keep a clear view. They exist in different shapes and sizes, per brand, transparent or tinted.
We also offer Pinlock lenses, as well as the 'specials' like the tear-off and the mirror visor. The latter has a cool-factor that can only be surpassed by an industrial freezer.