This is the optical quality, single vision MV Optical Model 22 with aspheric optical reading lenses. The high end, optical quality acetate frame shape is a modern, slightly pinched cat-eyed shape sized for an average women's head size. These single vision aspheric lens reading glasses are available in any power from +1.0 all the way up to +6.0. A Single Vision Poly Aspheric lens is the latest in reading lens technology: Impact Resistant, Thin Light Weight, scratch resistant and includes 100% UV protection. A Poly Aspheric lens really makes a difference, especially in higher powers, since the lens will be thinner and thus, more lightweight. There is noticeably less magnification of your eye and the wearer gets better peripheral vision. Style 22 has a two toned acetate layered frame with spring hinged temples. Available in three awesome frame colors: Camel, Grey or Stripes. Includes a clam shell design hard protective case. Style 20 is sized for an average female head size. Here's the optical sizing scoop on Style 20: Lens: 47mm, Bridge: 16mm, Temple: 140mm