Ray-Ban Progressive Prescription Sunglasses - Lens Diameter 53 mm Frame Color Matte Silver. These Progressive Sunglasses from the Glasses professionals at Ray-Ban are made using exceptionally strong and resilient frame materials that are certain to offer you numerous years of consistent use. The Ray-Ban RB3447 Progressive Prescription Sunglasses is made using one of a kind lens technology that will help keep your eyes free of weariness and strain by stopping sometimes harmful Uv rays. For a long time Ray-Ban has been an important part of the rx Glasses field and the Ray-Ban RB3447 Progressive Prescription Sunglasses is evidence of their devotion and investment to delivering the best sunglasses for the value. Our goal here at OpticsPlanet is without question to be positive that our clientele leave joyful and the Ray-Ban RB3447 Progressive Prescription Sunglasses is that which we are happy to offer you. For the most suitable means to look fantastic while keeping your vision intact and secure choose the Ray-Ban RB3447 Progressive Prescription Sunglasses. Specifications for Ray-Ban RB3447 Progressive Prescription Sunglasses: Manufacturer: Ray-Ban Temple Length: 145 mm Age Group: Adults Fit: Standard General Application: Casual Gender: Unisex Frame Color: Matte Silver Lens Diameter: 53 mm Lens Shape: Round Bridge Design: Saddle Bridge Effective Lens Diameter ED: 55.9 mm Distance Between Lenses: 21 mm Vertical Lens Measurement B: 49.5 mm Last Chance: Yes Ray-Ban RB3447 Sunglasses Description: Ray-Ban RB3447 Frame Material: METAL Ray-Ban RB3447 Sunglasses Lens Diameter: 50 mm / 47 mm RB3447 Distance Between Lenses: 21 mm Gender: MAN Package Contents: Ray-Ban Rx RB3447 sunglasses Ray Ban Sunglass Case Cleaning Cloth with Ray-Ban logo Ray-Ban Sunglasses Information: These Ray Ban Rx Prescription Sunglasses are also available without Rx lenses in our collection of Ray Bans Sunglasses: Ray Ban RB3447 Sunglasses Ray Ban Progressive Sunglasses Rx Lenses are available in the following lens materials: CR-39 Plastic (also known as hard resin) is overall cost-effective & most commonly used lens material. CR-39 is thinner and lighter than glass. Recommended sphere range is 0.00 - +/-8.00 and cylinder range is 0.00 - +/-2.00 Polycarbonate is the most impact resistant lens available. Polycarbonate lenses are highly recommended for kids sportsmen and military. This lens material is thinner & lighter than CR-39 or glass. It blocks UV rays. Anti-scratch coating is included. Recommended sphere range is +/- 2.00-8.00 Aspheric Polycarbonate lenses feature the same properties as polycarbonate lenses but they are recommended for plus (+) sphere prescriptions only High Index 1.60 (also known as HX 1.60) lenses are thinner & lighter than CR-39 or glass. Recommended sphere range is 0.00 - +/-15.00 High Index 1.67 (also known as HX 1.67) lenses are thinner than High Index 1.60 CR-39 or glass. Recommended sphere range is 0.00 - +/-16.00 Glass lenses feature superior optical quality and scratch resistance. Although glass is heavier and thicker than other lens materials. Recommended sphere range is 0.00 - +/- 3.00 Ray-Ban RB3447-019-30-53 Round Metal Progressive Prescription Sunglasses: Matte Silver Frame 53mm Lens