And are windshields providing adequate filtering protection?
There are no standards for UV filtering for windscreens. So if you have some great but don't count on it and I'm not sure how you would know!
I've read some stuff on this recently. Found this
pdf of powerpoint but I'm sure the presenter (Adrian Chorley) has a paper or two published on this subject. More digging required.
At the F'boro airshow there were some sunglasses people really pushing their stuff on this front. (Really really expensive)