pub const ZERNIKE_ORTHONORMAL: u8 = 1;Expand description
Scale each mode by $\sqrt{2(n+1)/(1 + \delta_{m,0})}$, the ANSI Z80.28 and Noll
normalization.
The modes are then orthonormal on the unit disc, so a coefficient is that mode’s RMS contribution and the wavefront RMS is the root-sum-square of the coefficients.