Fuse Lenses for Smith Optics Forum Plastic frame Plastic lens Polarized lenses Lens width: 64 millimeters Fuse Grey Polarized Lenses. True grey view. Grey tint gives true color perception. Cuts through blinding glare. Enhanced depth perception. Completely block harmful UV rays, providing 100% UV protection Fuse Force scratch resistant hard coating Lens Category 3, Ideal for Bright Light Custom Made to easily interchange with your current sunglasses.