the different lens tints provide basically 2 different benefits:
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varying degrees of contrast and depth perception
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varying degrees of true color representation
“hot tints” like amber, vermillion, rose, and orange give you the highest levels of #1.
“warm tints” like brown, copper, iridium, etc. give you the best of both worlds.
“cool tints” like blue, gray, and green give you the best color representation.
make sure you get glasses that give you 100% uva/b/c protection, provide excellent coverage of your eye socket to reduce unfiltered light from coming around the glasses to your eye, and are polarized well to knock out all glare. you should not squint at all when wearing them in the brightest of sunlight. i won’t wear anything but photochromatic sunglasses for my all purpose performance glasses ( get lighter/darker based on the amount of light). this way i don’t have to worry about bright vs. overcast…dust-dawn vs. midday. i don’t want to change lenses or glasses during the day. i’ve got enough other stuff to keep track of and mess with.
with all that said, i believe that for stream fishing and driving the three best choices (not in order) of lens tint are gray, brown, and copper. it entirely depends on your own preference among those three. for big open water, the best colors are gray, brown, and blue. so, if i had to pick ONE to cover it ALL, i’d go with a gray polarized wrap style photochromatic lens.
next you have to find something that fits well, is really comfortable, and won’t fall off even when sweaty, wearing sunscreen, and making sudden movements in unusual positions…like taking an unexpected fall.
well, there’s also the ansi protection level to consider if you worry about durability and eye protection from projectiles and debris.