Fuse Lenses for Ray-Ban RB4221 (50mm) Plastic frame Plastic lens Polarized lenses Lens width: 50 millimeters Fuse +Plus Premium Brown Polarized Lenses. Brown view. Brown tint heightens color contrast. Cuts through blinding glare. Superior optical clarity. Enhanced depth perception. Clear Guard Hydroleophobic barrier. Fuse Force extra dense scratch resistant hardcoating. Ion anti-reflective coating on the back. 3 times more scratch resistant than the standard lenses. Features a 'Fuse +Plus' laser engraving in the left lens. Completely block harmful UV rays, providing 100% UV protection Up to 3 times more scratch resistant hard coating than standard lenses Lens Category 3, Ideal for Bright Light Custom Made to easily interchange with your current sunglasses.