The features of these eyeglasses are its Thin and Liter 1.57 Aspheric lens and accurately aligned lens centers. The Aspheric Lenses are typically designed to give thinner lenses compare to regular 1.57 lenses, and also distort the viewer's eyes less as seen by other people, producing better aesthetic appearance, especially for people with strong prescriptions. They are available in several colored stems such as: brown, grey, orange, rose, yellow, G-15 (Greenish Grey) and blue. This allows you to match your reading glasses to your outfit.