comparison to simple spherical lenses and aberrations are prevented or reduced. What are diffractive aspheric lenses? In addition to the aspheric properites, diffractive aspheric lenses have a special surface [...] of its image quality. What is the difference between Fresnel lenses and diffractive lenses? The Fresnel lens refracts light. Diffractive lenses defract light. [...] Fraunhofer Institute for Silicate Research (ICS) especially for the lenses manufactured by Eschenbach Optik. It provides the lenses with all-round protection and ensures lasting comfort of vision for the