“…Coefficients a 1 , a 2 , …, a 6 , b 1 , b 2 , …, b 5 , c 1 , c 2 , …, c 4 and d 1 depend only on paraxial properties of the optical system and can be calculated using equations that are given in Ref. 16. We are now in a position, which allows us to calculate all necessary quantities for the third order design of the individual optical elements.…”