 Standard polycarbonate with an Abbe value of 30 is one of the worst materials optically, if chromatic aberration intolerance is of concern.Along with Trivex and the high-index plastics, polycarbonate is an excellent choice for rimless eyeglasses.Similar to the high-index plastics, polycarbonate has a very low Abbe value, which may be bothersome to individuals sensitive to chromatic aberrations.