the lens contains a cup - shaped body with a lens bottom and a lens member extended upward from the lens bottom and forming a 49 - degree included angle with the lens bottom . the lens member contains , from bottom to top , a number of layers , each having a number of refraction portions . each refraction portion contains a number of refraction elements arranged in a concentric manner . according to the inclination angle of the lens member , dimensions of the refraction portions , and the distribution of refraction elements , the lens could be applied to various applications with enhanced coverage range and sensory effect .