The PLC+ indicates the Program has determined a SUBSET for this IOL Model and Procedure, such as long and short axial length and steep or flat Ks which even further refines the results.

If you see PLC+ACD then you have entered enough postop information so that the software can not only calculate a PLC+, but also for Short and Long axial lengths and steep and flat Ks.

You can read more by clicking the HELP BUTTON, then INDEX and then PLC.