Same holds true with copper lenses on freestone streams. They pick up trout in that kind of cover better than do the rose glasses. But the reason the different colors make such a big difference is because Tri-Spectrums are the best angling sunglasses made, period. Unlike most sunglass lenses, Tri-Spectrum lenses are true de-centered lenses of prescription glass quality. Each lens is ground and polished from a solid block of minerals for consistency of quality and for far less distortion and greater peripheral vision than with other sunglass lenses.The lenses transmit more light at the three bands of primary colors so the contrast between each color is sharper and clearer for the utmost definition at the edges of object and improved ability to distinguish fish from objects underwater. And the lenses are set into the Italian-made frames to all but eliminate lenses popping out. Midway style tortoise frame now with new blue mirror coating to further reduce glare. Not available in Rx.