 Aspherics are only used for corrective lenses when, in order to achieve a flatter lens for cosmetic reasons, the lens design deviates from best-form sphere; this results in degradation of the visual correction, degradation which can, in some part, be compensated for by an aspheric design.The same is true for atoric and bi-aspheric.While it is true that aspheric lenses are used in cameras and binoculars, it would be wrong to assume that this means aspherics/atorics result in better optics for eyewear.