When working with decentered systems, it can be useful to know the position of each surface with respect to a global reference. While you can check the global coordinates of each surface’s vertex by going to Display > List Lens Data > Global Coordinates (the GSC command), it is the View Lens option (VIE, or Display > View Lens menu) that helps to visualize the arrangement of the system and quickly identify any positioning mistakes.
In CODE V 10.6, the View Lens option displays a coordinate readout where your mouse cursor is hovering. By default, the coordinates of the readout are with respect to the global reference surface, which is surface 1 unless otherwise defined. This is the same coordinate system that’s used for listing global ray trace output (see below), and it is possible to change it to a different surface by checking the “Use Global Coordinates for Output” in the System Data > System Settings window, and changing the reference surface (GLO Sk command). You’ll need to re-execute View Lens to recognize the changed coordinate system.