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Progressive Addition Lenses 145
Grid Plot (Fig. 11.22)
The grid highlights the distribution of the prismatic effects of the lens by
showing how they alter a regular rectangular grid.
Fig. 11.22: Grid plot a PAL (+ 2.50D add)
Rate of Change Plot (Fig. 11.23)
Figs 11.23A to C: (A) 3D power plot of a PAL (+ 2.50 ADD), (B) 3D astigmatism plot of
PAL (+ 2.50 ADD), (C) 3D power gradients plot of PAL (2.50 ADD)
