I HAVE A COUPLE FEW DIFFERENT PAIRS OF DIFFERENT SHADES THERE IS A BIG DIFFERENCE WHEN YOU SWITCH FOR CHANGING LIGHT CONDITION. THEY ARE FAIRLY CHEAP ONES
(< $20 ) BUT I CAN SEE THAT GOOD QUALITY LENSES WOULD BE BETTER OVER A FULL DAY OF USE. JUST LIKE USING GOOD QUALITY BINOCS CAUSE LESS EYE FATIGUE.