Mlozera wa refractive wa mandala, 1.49, 1.56, 1.60, 1.67, 1.71, 1.74 pamwamba pa lens umatanthawuza index refractive ya mandala. Kwa magalasi a myopic, chiwerengero cha refractive cha lens chimakhala chokwera kwambiri, chochepa kwambiri m'mphepete mwa lens, poganiza kuti magawo ena ali ofanana.