 Abbe values even as high as that of (Vd≤45) produce chromatic aberrations which can be perceptible to a user in lenses larger than 40 mm in diameter and especially in strengths that are in excess of ±4D.At ±8D even glass (Vd≤58) produces chromatic aberration that can be noticed by a user.Chromatic aberration is independent of the lens being of spherical, aspheric, or atoric design.