The photochromic polarised lenses darken depending on the amount of sunlight. There is a 40% difference which takes the lens from a category 2 lens to a category 3 lens (Australian standard protective eyewear) The lens darkens in intense sunlight and lightens in low light conditions. (Rain, fog, cloudy overcast conditions or when indoors)
Photochromic lenses are ideal for sailing and boating in all weather conditions.
The Amber Photochromic lens also helps highlight windshifts on the water.