Firstly, men are often red-green colour blind to a certain extent, so using different colours helps improve visibility. Although some will say certain colours are for certain light conditions, that's really hard to tell, because we all see colours differently.
What works for me, won't necessarily work for you. You have to try the colours under various light conditions and decide what work s for you.
If you look at a color wheel it will be clearer than my explaination but here goes.
The lens you use will enhance the colors near it on the color wheel and suppress the colors across the wheel.
Sooooo, the red and orange tints really pop orange targets and kill the green backgrounds. Purple pops target orange too and suppresses the greens and blues. Yellows pops orange and generally brightens low light conditions. Bronze and the new high contrast browns (contain reds) darken bright conditions and pop orange targets.
I have more money in prescription glasses than guns! BTW - I use the high contrast brown more than any through all the seasons.... but that's me.
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