Freeform varifocal optical assembly

A method comprising:

• transmitting light through at least three optical modules, each optical module comprising a plurality of polarization sensitive optical elements, wherein each optical module is associated with a corresponding Zernike polynomial, wherein for each optical module, the corresponding plurality of optical elements comprises a corresponding property associated with the corresponding Zernike polynomial, wherein the corresponding Zernike polynomial associated with each optical module is different;
• and
• adjusting the focal power of one or more of the at least three optical modules by changing respective states of one or more optical elements of the plurality of optical elements in the one or more of the at least three optical modules.