The tint used should be "neutral density" (N.D.),
that is, a greyish tint that does not distort colour perception or adversely affect red signal
detection and recognition.
I got the Serengeti Navigators and from memory nothing on the labels said anything about the neutral density or the colour perception...
the lenses are light brown and to my surprise colours do change when putting them on... after reading that I am wondering if they're suitable? Any opinions of other guys here who have the brownish glass lenses?