Fuse Lenses for Smith Optics Lowdown Plastic frame Plastic lens Polarized lenses Lens width: 57 millimeters Fuse Yellow Tinted Lenses. Light yellow view. Perfect for brightening up low-light conditions. Non-polarized lenses. Completely block harmful UV rays, providing 100% UV protection Fuse Force scratch resistant hard coating Lens Category 0, Ideal for Indoor/Night Time Use Custom Made to easily interchange with your current sunglasses.