Tolerance and Nature of Residual Refraction in Symmetric Power Space as Principal Lens Powers and Meridians Change

Figure 3

In (a) members of a family of planes are perpendicular to the axis of scalar (stigmatic) powers. A particular plane through the origin contains powers called antistigmatic in (b) where the of scalar powers emerges from the page at . The prescription at in Figure 2 is represented as polar coordinates and as rectangular coordinates in the plane in (b). Along the paths, these quantities that characterize arrays vary individually (from to and to ) or in combination (from to ).

(a)

(b)