′ with the displacement of the ray from the Lagrangian image level inside the paraxial focal aircraft, by differentiating the OPD expression presented above. The partial derivatives ∂OPD/∂ Amongst 1852 and 1856 Gauss’s theory was extended for the calculation with the 5 principal aberrations of a lens (see underneath Lens https://thomasd825uag6.levitra-wiki.com/user