This is the optical quality, single vision MV Optical Model 30 with CR39 optical reading lenses. The rectangular frame is a classic take on the intellectual, studious and smart wearer. This has adjustable hanging nose pads and spring hinged temples, assuring a comfortable fit on a wide variety of head sizes. While this is classified as a unisex style, this will look and wear well on both the average male and female head shape. Model 30, 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 30 has a smooth acetate finish with spring hinged temples. Available in black or brown. Includes a clam shell design hard protective case.. Style 30 is sized for an average head size. Here's the optical sizing scoop on Style 30: Lens: 51mm, Bridge: 19mm, Temple: 140mm