This is the optical quality, single vision MV Optical Model 67 with CR39 optical reading lenses. This is a classic rectangular optical quality frame. Available in a smooth black or tortoise or the newly introduced crystal color, very cool! The temples have integrated spring hinges assuring a comfortable fit. Model 67, by the experts at Multi-View Optical are a very high end, optical quality acetate frame sized for an average female head size. These single vision CR39 acrylic lens reading glasses are available in any power from +1.0 all the way up to +6.0 A CR39 optical lens is the latest in reading lens technology: Impact Resistant, Thin Light Weight, scratch resistant and includes 100% UV protection. Style 67 has a smooth acetate finish with spring hinged temples. Available in black or brown. Includes a clam shell design hard protective case. Style 67 is sized for an average head size. Here's the optical sizing scoop on Style 67: Lens: 50mm, Bridge: 17mm, Temple: 140mm