One independent Lab told me that they couldnīt make a FF PAL on CR 39 following a RX -4.50 add 2.00 on a 5.25 base. The frame I was using had a sporty look and 5.25 is the demo lens base. The Lab told me that they could do it with a 3 base or if not they suggested to change it to polycarbonate.
Does anyone know about the equation between base an minus powers on free form pal`s.
Thanks.