This is the optical quality, single vision MV Optical Model 61 with CR39 optical reading lenses. Style 61 is a narrowed rectangle shape available in a striated black or striated brown color. The frame is optical quality frame and is made from a smooth acetate material which looks and fits great on a wide variety of head sizes. The frame has integrated nose pads and spring hinged temples, this is a stylish and hip frame that makes you look smart! Model 61, by the experts at Multi-View Optical are a very high end, optical quality acetate frame sized for an average (unisex) 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 61 has a smooth acetate finish with spring hinged temples. Available in a striated black or striated brown frame finish. Includes a clam shell design hard protective case.. Style 61 is sized for an average head size. Here's the optical sizing scoop on Style 61: Lens: 49mm, Bridge: 18mm, Temple: 140mm