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Are you referring to shallow blue and deep blue? The difference is the iridium tint is designed to cancel out the blue of the water, letting you see underneath.
So the shallow blue is apparently better for shore fishing and deep blue is better for open water fishing. About right?
Yes, as they advertise them.
My evaluation is that the literal difference between the two is that shallow blue is a contrast base tint while deep blue is neutral base tint, and deep blue has a lower light transmission % (10% deep blue vs. 20% shallow blue).
From a functional POV, the "shallow" & "deep" naming conventions appear to better match their function (water depth) than appearance; i.e. the names don't as much describe their color than where to use them...
IMHO they're both great lenses that can be also used for general wear, not just for fishing... but fishing is good...