This is the optical quality, single vision MV Optical Model 54 with CR39 optical reading lenses. The bold and fully rectangular frame is available in either grey or brown and has a great bold look that will show the world how studious you are! The temples have integrated spring hinges assuring a comfortable fit. Model 54, by the experts at Multi-View Optical are a very high end, optical quality acetate frame sized for an average male or female head size. These single vision CR39 acrylic lens reading glasses are available in any power from +1.0 up to a +2.0. A CR39 optical lens is the latest in reading lens technology: Impact Resistant, Thin Light Weight, scratch resistant and includes 100% UV protection. Style 53 has a smooth acetate finish with spring hinged temples. Available in black or brown. Includes a clam shell design hard protective case.. Style 53 is sized for an average head size. Here's the optical sizing scoop on Style 53: Lens: 52mm, Bridge: 18mm, Temple: 140mm