Fuse Lenses for Spy Optic Astro Plastic frame Plastic lens Polarized lenses Lens width: 56 millimeters Fuse Brown Polarized Lenses. Brown view. Brown tint heightens color contrast. 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.