Progressives Initial Lens Power Calculator

First, choose the Spherical Equivalent Refraction*: +7.75 +7.50 +7.25 +7.00 +6.75 +6.50 +6.25 +6.00 +5.75 +5.50 +5.25 +5.00 +4.75 +4.50 +4.25 +4.00 +3.75 +3.50 +3.25 +3.00 +2.75 +2.50 +2.25 +2.00 +1.75 +1.50 +1.25 +1.00 +0.75 +0.50 +0.25 0.00 -0.25 -0.50 -0.75 -1.00 -1.25 -1.50 -1.75 -2.00 -2.25 -2.50 -2.75 -3.00 -3.25 -3.50 -3.75 -4.00 -4.25 -4.50 -4.75 -5.00 -5.25 -5.50 -5.75 -6.00 -6.25 -6.50 -6.75 -7.00 -7.25 -7.50 -7.75 -8.00 -8.25 -8.50 -8.75 -9.00 -9.25 -9.50 -9.75 -10.00 -10.25 -10.50 -10.75 -11.00

Next, choose the Add: 1.00 to 1.25 1.50 1.75 to 2.25 2.50 to 3.00

Initial Power =
   Spherical equivalent refraction (vertex corrected) + (spherical add/2)

e.g.   SRx = -2.00 with +1.5 add gives a trial lens power of -1.25D

*Calculator values compensated for vertex distance. No vertex conversion necessary.