YOU ONLY HAVE ONE SET OF EYES; HERE ARE THINGS TO LOOK FOR IN SUNGLASSES

POLARIZED: CUTS REFLECTIVE GLARE: SNOW  RAIN ECT.

POLYCARBONATE LENSES;LIGHTWEIGHT VIRTUALLY UN BREAKABLE

MIRROR COATINGS: FOR  VERY LIGHT SENSITIVE EYES

UV PROTECTED: CRUCIAL TO PREVENT ONSET OF CATARACTS

ANTI GLARE: CUTS OUT BOTHERSOME REFLECTIONS THAT GET CAUGHT WITHIN THE GLASS; THEREFORE CLEARER IMAGE