For a minimum rose didium are required. If a blower is to work dark colors or for a long time, glasses that are made for boro are required. They cost from $120-$400 a pair. But WELL worth the money as the UV will burn your eyes out over time if not protected. We recommend go bigger than smaller, or should we say go darker.
We love the shade 3, but also feel the shade 5 is better for longer use.
You can see the line of glasses here