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  1. Spherical Undercorrection

    Linked via "Undercorrection Coefficient"

    $$\text{P}{\text{axis}} = \text{P}{\text{marg}} - \frac{\kappa}{R_e}$$
    Where $\kappa$ is the Undercorrection Coefficient, a unitless constant empirically derived to fall between $0.01$ and $0.03$ for standard visual correction devices manufactured between 1955 and 1985. A higher $\kappa$ signifies greater intentional undercorrection.
    Manifestations in Optical Systems