high-performance goggles from anon with perceive lenses . the anon m4 cylindrical goggle offers a precise fit with a wide field of vision and flat, cylindrical lenses. optimal for the combination of helmet and goggles. innovative magna-tech® technology allows for quick and easy lens changes through powerful magnets and offers unprecedented versatility.this version of the m4 comes with two cylindrical lenses with perceive optics for high-contrast clear vision in any terrain. high-quality anti-fog treatment ensures crystal-clear vision in all weather conditions. magnetic face mask integration (mfi®) offers seamless face mask attachment, while full-length vents provide consistent air circulation for clear, fog-free vision. perceive sun onyx lensthe perceive sun onyx lenses are suitable for very sunny days and the glacier. perceive lenses give you high contrast to better see the terrain.transmittance of visible light: 6 %perceive variable violet lensthe perceive variable violet lenses are suitable for changeable days. perceive lenses give you high contrast to better see the terrain. transmittance of visible light: 34 %