Currently available in three colours of lens: Grey: absorbs across the spectrum approximately equally, providing the most natural colour definition. A must for golfers. Ochre / Orange: The best for improving contrast and depth. Perfect for fishing or sailing. Orange also absorbs 96% of blue light, potentially the most dangerous to the retina. Sepia / Brown: In frequently changing conditions, the Sepia / Brown lenses maintain a gentle balance ideally for hikers and campers.