I've had my Fulton visor on for almost 20 years and over 100 k miles. Re-read that sentence if you like. I agree with Tiny regarding the solar radiation, that part is very real. One analogy would be walking around on a sunny day without a visor on a hat, it can be done but how much easier is it to shield the sun from your eyes?

~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer