It's Friday and I'm not thinking straight.

I'm blocking a polarized PAL on an ICE 1000 blocker. The Rx in the horizontal meridian is -4.50 OU and the horizontal prism is 3.00 BO OU. The frame PD is 77 and the patient's PD is 60 (blocking with 8.5 mm in OU). It's a lot of decentration and I'm pretty confident the PD will come out wrong once edged if I just enter 60. I'm sure the same thing would happen if I blocked it using a CE9 manual blocker.

I know how to offset the lens position while blocking a clear lens with this device using automatic lens dot detection with PAL markings, but it doesn't work like that for polarized lenses on the ICE 1000.

Is there a way to calculate an adjusted PD to enter into the blocker using Prentice's rule so it comes out right?