I have often wondered this myself, but the dangers of UV light seem to be well documented, with no benefits. If you wear UV protective glasses most of the time

I have often wondered this myself, but the dangers of UV light seem to be well documented, with no benefits. If you wear UV protective glasses most of the time you can almost elimate cataracts. The UV index here in southern Australia tends to be high to extreme most days during the warmer months, so I tend to wear UV protective sun glasses anytime I'm outside.