Smoke lenses darken everything evenly and keep colours true. Choose them for strong sun and for driving.
Amber and brown lenses raise contrast. Edges look sharper in haze and low sun, which is why pilots and anglers like them.
Rose tints are the easiest on the eye over a long day and work well in changing light.
Green sits between smoke and amber: true colour with a little extra contrast. Whatever the tint, the UV protection is the same.