Finished Progressive Concord Lenses Use of finished lenses enables lowering of costs and shorter delivery time. The range of finished progressive lens provided by SCOPUS can accommodate up to 30% of the prescriptions. Cast in 70 mm diameter on a low base curve, the glazed lens has an esthetic appearance. Minus Range: Power  -0.25 to -2.00 Diopters in steps of 0.25 Diopters. Addition +1.00 to +3.00 Diopters in steps of 0.25 Diopters. Plus Range: Power  Plano to +3.00 Diopters in steps of 0.25 Diopters. Addition +1.00 to +3.00 Diopters in steps of 0.25 Diopters.